diff --git a/extensions/cornerstone/src/components/DicomUpload/DicomUpload.tsx b/extensions/cornerstone/src/components/DicomUpload/DicomUpload.tsx
index dd91df875..edcdcaffe 100644
--- a/extensions/cornerstone/src/components/DicomUpload/DicomUpload.tsx
+++ b/extensions/cornerstone/src/components/DicomUpload/DicomUpload.tsx
@@ -16,7 +16,7 @@ type DicomUploadProps = {
 
 function DicomUpload({ dataSource, onComplete, onStarted }: DicomUploadProps): ReactElement {
   const baseClassNames =
-    'min-h-[375px] flex flex-col bg-black select-none rounded-lg overflow-hidden';
+    'min-h-[375px] flex flex-col bg-background select-none rounded-lg overflow-hidden';
   const [dicomFileUploaderArr, setDicomFileUploaderArr] = useState([]);
 
   const onDrop = useCallback(async acceptedFiles => {
diff --git a/extensions/cornerstone/src/components/DicomUpload/DicomUploadProgress.tsx b/extensions/cornerstone/src/components/DicomUpload/DicomUploadProgress.tsx
index 3fc1b0118..2843ce862 100644
--- a/extensions/cornerstone/src/components/DicomUpload/DicomUploadProgress.tsx
+++ b/extensions/cornerstone/src/components/DicomUpload/DicomUploadProgress.tsx
@@ -372,7 +372,7 @@ function DicomUploadProgress({
   return (
     <div className="flex grow flex-col">
       {getNumCompletedAndTimeRemainingComponent()}
-      <div className="flex grow flex-col overflow-hidden bg-black text-lg">
+      <div className="flex grow flex-col overflow-hidden bg-background text-lg">
         {getPercentCompleteComponent()}
         <div className="ohif-scrollbar h-1 grow overflow-y-scroll px-2">
           {dicomFileUploaderArr
diff --git a/extensions/cornerstone/src/components/PanelAccordionTrigger.tsx b/extensions/cornerstone/src/components/PanelAccordionTrigger.tsx
index a756db4f2..c44696f9d 100644
--- a/extensions/cornerstone/src/components/PanelAccordionTrigger.tsx
+++ b/extensions/cornerstone/src/components/PanelAccordionTrigger.tsx
@@ -28,7 +28,7 @@ export default function PanelAccordionTrigger(props) {
       <div className={`inline-flex text-base ${isActive ? 'bg-popover' : 'bg-muted'} flex-grow`}>
         <button onClick={onClickDefault.bind(props)}>
           <span
-            className={`inline-flex rounded-l border-r border-black ${isActive ? 'bg-highlight' : 'bg-muted'}`}
+            className={`inline-flex rounded-l border-r border-background ${isActive ? 'bg-highlight' : 'bg-muted'}`}
           >
             {count !== undefined ? <span className="px-2">{count}</span> : null}
             {colorHex && <ColorCircle colorHex={colorHex} />}
diff --git a/extensions/cornerstone/src/components/SegmentationToolConfig.tsx b/extensions/cornerstone/src/components/SegmentationToolConfig.tsx
index 7b49b9885..4b5e4619c 100644
--- a/extensions/cornerstone/src/components/SegmentationToolConfig.tsx
+++ b/extensions/cornerstone/src/components/SegmentationToolConfig.tsx
@@ -34,7 +34,7 @@ export default function SegmentationToolConfig() {
   };
 
   return (
-    <div className="bg-muted flex flex-col gap-2 border-b border-b-[2px] border-black px-2 py-3">
+    <div className="bg-muted flex flex-col gap-2 border-b border-b-[2px] border-background px-2 py-3">
       <div className="flex items-center gap-2">
         <Switch
           checked={previewEdits}
diff --git a/extensions/cornerstone/src/components/WindowLevelActionMenu/VolumeRenderingPresetsContent.tsx b/extensions/cornerstone/src/components/WindowLevelActionMenu/VolumeRenderingPresetsContent.tsx
index 6a7ac0f86..b4ae6589a 100644
--- a/extensions/cornerstone/src/components/WindowLevelActionMenu/VolumeRenderingPresetsContent.tsx
+++ b/extensions/cornerstone/src/components/WindowLevelActionMenu/VolumeRenderingPresetsContent.tsx
@@ -61,7 +61,7 @@ export function VolumeRenderingPresetsContent({ presets, viewportId, hide }: Pro
                 className={
                   selectedPreset?.name === preset.name
                     ? 'border-highlight h-[75px] w-[95px] max-w-none rounded border-2'
-                    : 'hover:border-highlight h-[75px] w-[95px] max-w-none rounded border-2 border-black'
+                    : 'hover:border-highlight h-[75px] w-[95px] max-w-none rounded border-2 border-background'
                 }
               />
               <label className="text-muted-foreground mt-1 text-left text-xs">
diff --git a/extensions/cornerstone/src/customizations/captureViewportModalCustomization.tsx b/extensions/cornerstone/src/customizations/captureViewportModalCustomization.tsx
index c9e08a4bb..2d05a71df 100644
--- a/extensions/cornerstone/src/customizations/captureViewportModalCustomization.tsx
+++ b/extensions/cornerstone/src/customizations/captureViewportModalCustomization.tsx
@@ -66,7 +66,7 @@ function ViewportDownloadFormNew({
           >
             {warningState.enabled && showWarningMessage && (
               <div
-                className="text-foreground absolute left-1/2 bottom-[5px] z-[1000] -translate-x-1/2 whitespace-nowrap rounded bg-black p-3 text-xs font-bold"
+                className="text-foreground absolute left-1/2 bottom-[5px] z-[1000] -translate-x-1/2 whitespace-nowrap rounded bg-background p-3 text-xs font-bold"
                 style={{
                   fontSize: '12px',
                 }}
diff --git a/extensions/default/src/Components/DataSourceConfigurationModalComponent.tsx b/extensions/default/src/Components/DataSourceConfigurationModalComponent.tsx
index 14a51ba79..28398eeb3 100644
--- a/extensions/default/src/Components/DataSourceConfigurationModalComponent.tsx
+++ b/extensions/default/src/Components/DataSourceConfigurationModalComponent.tsx
@@ -100,7 +100,7 @@ function DataSourceConfigurationModalComponent({
   const getSelectedItemBackgroundClasses = itemIndex =>
     itemIndex < selectedItems.length
       ? classNames(
-          'bg-black/[.4]',
+          'bg-background/[.4]',
           itemIndex !== itemLabels.length - 1 ? 'hover:bg-transparent active:bg-popover' : ''
         )
       : 'bg-transparent';
@@ -121,7 +121,7 @@ function DataSourceConfigurationModalComponent({
         <div className="text-highlight text-[20px]">
           {t(`Error fetching ${itemLabels[selectedItems.length]} list`)}
         </div>
-        <div className="grow bg-black p-4 text-[14px]">{errorMessage}</div>
+        <div className="grow bg-background p-4 text-[14px]">{errorMessage}</div>
       </div>
     );
   };
@@ -180,7 +180,7 @@ function DataSourceConfigurationModalComponent({
   return (
     <div className="flex h-[calc(100vh-300px)] select-none flex-col gap-4 pt-0.5">
       {getSelectedItemsComponent()}
-      <div className="h-0.5 w-full shrink-0 bg-black"></div>
+      <div className="h-0.5 w-full shrink-0 bg-background"></div>
       {errorMessage ? (
         getErrorComponent()
       ) : (
diff --git a/extensions/default/src/Components/ItemListComponent.tsx b/extensions/default/src/Components/ItemListComponent.tsx
index 12d7011df..ebc348b48 100644
--- a/extensions/default/src/Components/ItemListComponent.tsx
+++ b/extensions/default/src/Components/ItemListComponent.tsx
@@ -44,7 +44,7 @@ function ItemListComponent({
           <InputFilter.ClearButton className="text-primary mr-0.5 p-0.5" />
         </InputFilter>
       </div>
-      <div className="relative flex min-h-[1px] grow flex-col bg-black text-[14px]">
+      <div className="relative flex min-h-[1px] grow flex-col bg-background text-[14px]">
         {itemList == null ? (
           <LoadingIndicatorProgress className={'h-full w-full'} />
         ) : itemList.length === 0 ? (
diff --git a/extensions/default/src/DicomTagBrowser/DicomTagTable.tsx b/extensions/default/src/DicomTagBrowser/DicomTagTable.tsx
index 2338fe421..6da3b8903 100644
--- a/extensions/default/src/DicomTagBrowser/DicomTagTable.tsx
+++ b/extensions/default/src/DicomTagBrowser/DicomTagTable.tsx
@@ -39,7 +39,7 @@ const RowComponent = ({
     <div
       style={{ ...style, ...rowStyle }}
       className={classNames(
-        'hover:bg-primary/25 border-input text-foreground flex w-full flex-row items-center break-all bg-black text-base',
+        'hover:bg-primary/25 border-input text-foreground flex w-full flex-row items-center break-all bg-background text-base',
         lineHeightClassName
       )}
       key={keyPrefix}
@@ -281,7 +281,7 @@ function DicomTagTable({ rows }: { rows: Row[] }) {
         valueRef={valueRef}
       />
       <div
-        className="relative m-auto border-2 border-black bg-black"
+        className="relative m-auto border-2 border-background bg-background"
         style={{ height: '32rem' }}
       >
         {isHeaderRendered() && (
diff --git a/extensions/default/src/Panels/StudyBrowser/PanelStudyBrowser.tsx b/extensions/default/src/Panels/StudyBrowser/PanelStudyBrowser.tsx
index db2a32075..d8c8a8e16 100644
--- a/extensions/default/src/Panels/StudyBrowser/PanelStudyBrowser.tsx
+++ b/extensions/default/src/Panels/StudyBrowser/PanelStudyBrowser.tsx
@@ -410,7 +410,7 @@ function PanelStudyBrowser({
         />
         <Separator
           orientation="horizontal"
-          className="bg-black"
+          className="bg-background"
           thickness="2px"
         />
       </>
diff --git a/extensions/default/src/Toolbar/ToolbarLayoutSelector.tsx b/extensions/default/src/Toolbar/ToolbarLayoutSelector.tsx
index abb6cac5d..d087ad4cf 100644
--- a/extensions/default/src/Toolbar/ToolbarLayoutSelector.tsx
+++ b/extensions/default/src/Toolbar/ToolbarLayoutSelector.tsx
@@ -176,7 +176,7 @@ function ToolbarLayoutSelectorWithServices({
           )}
 
           {/* Right Side - Grid Layout */}
-          <div className="bg-muted flex flex-col gap-2.5 border-l-2 border-solid border-black p-2">
+          <div className="bg-muted flex flex-col gap-2.5 border-l-2 border-solid border-background p-2">
             <div className="text-muted-foreground text-xs">{t('Custom')}</div>
             <LayoutSelector.GridSelector
               rows={rows}
diff --git a/extensions/default/src/ViewerLayout/index.tsx b/extensions/default/src/ViewerLayout/index.tsx
index c1bbb42cf..f2e755eaf 100644
--- a/extensions/default/src/ViewerLayout/index.tsx
+++ b/extensions/default/src/ViewerLayout/index.tsx
@@ -9,7 +9,7 @@ import SidePanelWithServices from '../Components/SidePanelWithServices';
 import { Onboarding, ResizablePanelGroup, ResizablePanel, ResizableHandle } from '@ohif/ui-next';
 import useResizablePanels from './ResizablePanelsHook';
 
-const resizableHandleClassName = 'mt-[1px] bg-black';
+const resizableHandleClassName = 'mt-[1px] bg-background';
 
 function ViewerLayout({
   // From Extension Module Params
@@ -79,11 +79,11 @@ function ViewerLayout({
    * is sized to our viewport.
    */
   useEffect(() => {
-    document.body.classList.add('bg-black');
+    document.body.classList.add('bg-background');
     document.body.classList.add('overflow-hidden');
 
     return () => {
-      document.body.classList.remove('bg-black');
+      document.body.classList.remove('bg-background');
       document.body.classList.remove('overflow-hidden');
     };
   }, []);
@@ -158,11 +158,11 @@ function ViewerLayout({
         appConfig={appConfig}
       />
       <div
-        className="relative flex w-full flex-row flex-nowrap items-stretch overflow-hidden bg-black"
+        className="relative flex w-full flex-row flex-nowrap items-stretch overflow-hidden bg-background"
         style={{ height: 'calc(100vh - 52px' }}
       >
         <React.Fragment>
-          {showLoadingIndicator && <LoadingIndicatorProgress className="h-full w-full bg-black" />}
+          {showLoadingIndicator && <LoadingIndicatorProgress className="h-full w-full bg-background" />}
           <ResizablePanelGroup {...resizablePanelGroupProps}>
             {/* LEFT SIDEPANELS */}
             {hasLeftPanels ? (
@@ -186,7 +186,7 @@ function ViewerLayout({
             <ResizablePanel {...resizableViewportGridPanelProps}>
               <div className="flex h-full flex-1 flex-col">
                 <div
-                  className="relative flex h-full flex-1 items-center justify-center overflow-hidden bg-black"
+                  className="relative flex h-full flex-1 items-center justify-center overflow-hidden bg-background"
                   onMouseEnter={handleMouseEnter}
                 >
                   <ViewportGridComp
diff --git a/extensions/tmtv/src/Panels/PanelPetSUV.tsx b/extensions/tmtv/src/Panels/PanelPetSUV.tsx
index e33591c7c..37871162b 100644
--- a/extensions/tmtv/src/Panels/PanelPetSUV.tsx
+++ b/extensions/tmtv/src/Panels/PanelPetSUV.tsx
@@ -163,7 +163,7 @@ export default function PanelPetSUV() {
   return (
     <>
       <div className="ohif-scrollbar flex min-h-0 flex-auto select-none flex-col justify-between overflow-auto">
-        <div className="flex min-h-0 flex-1 flex-col bg-black text-base">
+        <div className="flex min-h-0 flex-1 flex-col bg-background text-base">
           <PanelSection defaultOpen={true}>
             <PanelSection.Header>{t('Patient Information')}</PanelSection.Header>
             <PanelSection.Content>
diff --git a/extensions/usAnnotation/src/panels/USAnnotationPanel.tsx b/extensions/usAnnotation/src/panels/USAnnotationPanel.tsx
index dfd8044b6..3d3c74ce2 100644
--- a/extensions/usAnnotation/src/panels/USAnnotationPanel.tsx
+++ b/extensions/usAnnotation/src/panels/USAnnotationPanel.tsx
@@ -395,7 +395,7 @@ export default function USAnnotationPanel() {
    *  🖼  Final Render                                      */
   return (
     <div
-      className="text-foreground h-full bg-black"
+      className="text-foreground h-full bg-background"
       style={{ minWidth: 240, maxWidth: 480, width: '100%' }}
     >
       {/* Workflow */}
diff --git a/platform/app/src/routes/Local/Local.tsx b/platform/app/src/routes/Local/Local.tsx
index e5cf9cf4c..a24fd6266 100644
--- a/platform/app/src/routes/Local/Local.tsx
+++ b/platform/app/src/routes/Local/Local.tsx
@@ -111,9 +111,9 @@ function Local({ modePath }: LocalProps) {
 
   // Set body style
   useEffect(() => {
-    document.body.classList.add('bg-black');
+    document.body.classList.add('bg-background');
     return () => {
-      document.body.classList.remove('bg-black');
+      document.body.classList.remove('bg-background');
     };
   }, []);
 
@@ -139,7 +139,7 @@ function Local({ modePath }: LocalProps) {
               <div className="space-y-2 py-6 text-center">
                 {dropInitiated ? (
                   <div className="flex flex-col items-center justify-center pt-12">
-                    <LoadingIndicatorProgress className={'h-full w-full bg-black'} />
+                    <LoadingIndicatorProgress className={'h-full w-full bg-background'} />
                   </div>
                 ) : (
                   <div className="space-y-2">
diff --git a/platform/app/src/routes/NotFound/NotFound.tsx b/platform/app/src/routes/NotFound/NotFound.tsx
index e22c82147..b5553ec88 100644
--- a/platform/app/src/routes/NotFound/NotFound.tsx
+++ b/platform/app/src/routes/NotFound/NotFound.tsx
@@ -13,7 +13,7 @@ const NotFound = ({
   const navigate = useNavigate();
 
   return (
-    <div className="absolute flex h-full w-full items-center justify-center bg-black">
+    <div className="absolute flex h-full w-full items-center justify-center bg-background">
       <div className="flex flex-col">
         <div className="bg-background flex items-center justify-center rounded-t-2xl p-6">
           <Icons.IllustrationNotFound />
diff --git a/platform/docs/src/pages/colors-and-type.tsx b/platform/docs/src/pages/colors-and-type.tsx
index 089d30f57..9d7078fc0 100644
--- a/platform/docs/src/pages/colors-and-type.tsx
+++ b/platform/docs/src/pages/colors-and-type.tsx
@@ -131,7 +131,7 @@ export default function ComponentShowcase() {
       title="Colors and Typography"
       description="Colors and Typography"
     >
-      <div className="text-foreground min-h-screen bg-black">
+      <div className="text-foreground min-h-screen bg-background">
         <div className="mx-auto my-4 max-w-5xl pt-4 pb-6">
           {/* Navigation cards */}
           <div className="mb-8 grid grid-cols-1 gap-5 md:grid-cols-3">
@@ -396,7 +396,7 @@ function ShowcaseRow({ title, description, children, code }: ShowcaseRowProps) {
         </div>
       </div>
       {showCode && (
-        <pre className="border-input mt-4 overflow-x-auto rounded-md border bg-black p-4 text-sm">
+        <pre className="border-input mt-4 overflow-x-auto rounded-md border bg-background p-4 text-sm">
           <code>{code}</code>
         </pre>
       )}
@@ -425,7 +425,7 @@ function ShowcaseRow({ title, description, children, code }: ShowcaseRowProps) {
 //       </div>
 //       <div className="showcase-content mb-4">{children}</div>
 //       {showCode && (
-//         <pre className="mt-4 overflow-x-auto rounded-md bg-black p-4 text-sm">
+//         <pre className="mt-4 overflow-x-auto rounded-md bg-background p-4 text-sm">
 //           <code>{code}</code>
 //         </pre>
 //       )}
diff --git a/platform/docs/src/pages/components-list.tsx b/platform/docs/src/pages/components-list.tsx
index 2ec48c375..08e88a2fa 100644
--- a/platform/docs/src/pages/components-list.tsx
+++ b/platform/docs/src/pages/components-list.tsx
@@ -50,7 +50,7 @@ export default function ComponentsList() {
 
           return (
             <TooltipProvider>
-              <div className="text-foreground min-h-screen bg-black">
+              <div className="text-foreground min-h-screen bg-background">
                 <div className="mx-auto my-4 max-w-5xl pt-4 pb-6">
                   {/* Navigation cards */}
                   <div className="mb-8 grid grid-cols-1 gap-5 md:grid-cols-3">
diff --git a/platform/docs/src/pages/components.tsx b/platform/docs/src/pages/components.tsx
index ae2267035..b49931da0 100644
--- a/platform/docs/src/pages/components.tsx
+++ b/platform/docs/src/pages/components.tsx
@@ -131,7 +131,7 @@ export default function ComponentShowcase() {
       title="OHIF Viewer Design System"
       description="OHIF Viewer Design System"
     >
-      <div className="text-foreground min-h-screen bg-black">
+      <div className="text-foreground min-h-screen bg-background">
         <div className="mx-auto my-4 max-w-5xl pt-6 pb-3">
           <div className="grid grid-cols-1 gap-5 md:grid-cols-3">
             <a
@@ -227,7 +227,7 @@ function ShowcaseRow({ title, description, children, code }: ShowcaseRowProps) {
 
       {/* Code Section */}
       {showCode && (
-        <pre className="mt-4 overflow-x-auto rounded-md bg-black p-4 text-sm">
+        <pre className="mt-4 overflow-x-auto rounded-md bg-background p-4 text-sm">
           <code>{code}</code>
         </pre>
       )}
@@ -256,7 +256,7 @@ function ShowcaseRow({ title, description, children, code }: ShowcaseRowProps) {
 //       </div>
 //       <div className="showcase-content mb-4">{children}</div>
 //       {showCode && (
-//         <pre className="mt-4 overflow-x-auto rounded-md bg-black p-4 text-sm">
+//         <pre className="mt-4 overflow-x-auto rounded-md bg-background p-4 text-sm">
 //           <code>{code}</code>
 //         </pre>
 //       )}
diff --git a/platform/docs/src/pages/components/AllinOneMenuShowcase.tsx b/platform/docs/src/pages/components/AllinOneMenuShowcase.tsx
index e7939c323..895d721a1 100644
--- a/platform/docs/src/pages/components/AllinOneMenuShowcase.tsx
+++ b/platform/docs/src/pages/components/AllinOneMenuShowcase.tsx
@@ -58,7 +58,7 @@ export default function AllinOneMenuShowcase() {
       description="A structured menu that consolidates controls and actions."
       code={`<IconMenu icon="viewport-window-level" menuStyle={{ width: 212, maxHeight: 500 }}>…</IconMenu>`}
     >
-      <div className="border-input/70 relative flex h-12 items-center rounded border bg-black px-4">
+      <div className="border-input/70 relative flex h-12 items-center rounded border bg-background px-4">
         <IconMenu
           icon="viewport-window-level"
           iconClassName="text-xl text-highlight hover:bg-primary/30 cursor-pointer rounded"
diff --git a/platform/docs/src/pages/components/ShowcaseRow.tsx b/platform/docs/src/pages/components/ShowcaseRow.tsx
index a1c92400c..53a6ef59a 100644
--- a/platform/docs/src/pages/components/ShowcaseRow.tsx
+++ b/platform/docs/src/pages/components/ShowcaseRow.tsx
@@ -40,7 +40,7 @@ export default function ShowcaseRow({ title, description, children, code }: Show
         </div>
       </div>
       {showCode && (
-        <pre className="border-input mt-4 overflow-x-auto rounded-md border bg-black p-4 text-sm">
+        <pre className="border-input mt-4 overflow-x-auto rounded-md border bg-background p-4 text-sm">
           <code>{code}</code>
         </pre>
       )}
diff --git a/platform/docs/src/pages/patterns.tsx b/platform/docs/src/pages/patterns.tsx
index 12d5f2836..e50d20b52 100644
--- a/platform/docs/src/pages/patterns.tsx
+++ b/platform/docs/src/pages/patterns.tsx
@@ -26,7 +26,7 @@ export default function ComponentShowcase() {
       title="Patterns"
       description="Patterns and example layouts"
     >
-      <div className="text-foreground min-h-screen bg-black">
+      <div className="text-foreground min-h-screen bg-background">
         <div className="mx-auto my-4 max-w-5xl pt-4 pb-6">
           {/* Navigation cards */}
           <div className="mb-8 grid grid-cols-1 gap-5 md:grid-cols-3">
@@ -172,7 +172,7 @@ function ShowcaseRow({ title, description, children, code }: ShowcaseRowProps) {
         </div>
       </div>
       {showCode && (
-        <pre className="border-input mt-4 overflow-x-auto rounded-md border bg-black p-4 text-sm">
+        <pre className="border-input mt-4 overflow-x-auto rounded-md border bg-background p-4 text-sm">
           <code>{code}</code>
         </pre>
       )}
@@ -201,7 +201,7 @@ function ShowcaseRow({ title, description, children, code }: ShowcaseRowProps) {
 //       </div>
 //       <div className="showcase-content mb-4">{children}</div>
 //       {showCode && (
-//         <pre className="mt-4 overflow-x-auto rounded-md bg-black p-4 text-sm">
+//         <pre className="mt-4 overflow-x-auto rounded-md bg-background p-4 text-sm">
 //           <code>{code}</code>
 //         </pre>
 //       )}
diff --git a/platform/docs/src/pages/patterns/patterns-measurements.tsx b/platform/docs/src/pages/patterns/patterns-measurements.tsx
index 1daf39a6b..6347b7891 100644
--- a/platform/docs/src/pages/patterns/patterns-measurements.tsx
+++ b/platform/docs/src/pages/patterns/patterns-measurements.tsx
@@ -49,7 +49,7 @@ export default function Measurements() {
   return (
     <BrowserOnly>
       {() => (
-        <div className="px-auto my-4 flex min-h-screen w-full justify-center bg-black py-12">
+        <div className="px-auto my-4 flex min-h-screen w-full justify-center bg-background py-12">
           <TooltipProvider>
             {/* Simulated Panel List for "Segmentation" */}
             <div className="w-64 space-y-0">
diff --git a/platform/docs/src/pages/patterns/patterns-segmentation.tsx b/platform/docs/src/pages/patterns/patterns-segmentation.tsx
index ee7a1c95b..56dd883cb 100644
--- a/platform/docs/src/pages/patterns/patterns-segmentation.tsx
+++ b/platform/docs/src/pages/patterns/patterns-segmentation.tsx
@@ -241,7 +241,7 @@ export default function SegmentationPanel() {
   };
 
   return (
-    <div className="px-auto flex min-h-screen w-full justify-center bg-black py-12">
+    <div className="px-auto flex min-h-screen w-full justify-center bg-background py-12">
       <div className="w-64 space-y-0">
         <TooltipProvider>
           <Accordion
diff --git a/platform/docs/src/pages/patterns/patterns-tmtv.tsx b/platform/docs/src/pages/patterns/patterns-tmtv.tsx
index 6dc558624..af3b53316 100644
--- a/platform/docs/src/pages/patterns/patterns-tmtv.tsx
+++ b/platform/docs/src/pages/patterns/patterns-tmtv.tsx
@@ -76,7 +76,7 @@ export default function TMTVPatterns() {
   return (
     <BrowserOnly>
       {() => (
-        <div className="px-auto my-4 flex min-h-screen w-full justify-center bg-black py-12">
+        <div className="px-auto my-4 flex min-h-screen w-full justify-center bg-background py-12">
           <div className="w-64 space-y-0">
             <Accordion
               type="multiple"
diff --git a/platform/ui-next/src/components/DataRow/DataRow.tsx b/platform/ui-next/src/components/DataRow/DataRow.tsx
index ad0e58125..a75b3621a 100644
--- a/platform/ui-next/src/components/DataRow/DataRow.tsx
+++ b/platform/ui-next/src/components/DataRow/DataRow.tsx
@@ -255,7 +255,7 @@ const DataRowComponent = React.forwardRef<HTMLDivElement, DataRowProps>(
           {/* Number Box */}
           {number !== null && (
             <div
-              className={`flex h-7 max-h-7 w-7 flex-shrink-0 items-center justify-center rounded-l border-r border-black text-base ${
+              className={`flex h-7 max-h-7 w-7 flex-shrink-0 items-center justify-center rounded-l border-r border-background text-base ${
                 isSelected ? 'bg-highlight text-black' : 'bg-muted text-muted-foreground'
               } overflow-hidden`}
             >
diff --git a/platform/ui-next/src/components/DateRange/DateRange.tsx b/platform/ui-next/src/components/DateRange/DateRange.tsx
index f07547ed3..22797fedf 100644
--- a/platform/ui-next/src/components/DateRange/DateRange.tsx
+++ b/platform/ui-next/src/components/DateRange/DateRange.tsx
@@ -92,7 +92,7 @@ export function DatePickerWithRange({
               value={start}
               onChange={e => handleInputChange(e, 'start')}
               className={cn(
-                'border-inputfield-main focus:border-inputfield-focus hover:text-foreground h-[32px] w-full justify-start rounded border bg-black py-[6.5px] pl-[6.5px] pr-[6.5px] text-left text-base font-normal hover:bg-black',
+                'border-inputfield-main focus:border-inputfield-focus hover:text-foreground h-[32px] w-full justify-start rounded border bg-background py-[6.5px] pl-[6.5px] pr-[6.5px] text-left text-base font-normal hover:bg-background',
                 !start && 'text-muted-foreground'
               )}
               data-cy="input-date-range-start"
@@ -129,7 +129,7 @@ export function DatePickerWithRange({
               value={end}
               onChange={e => handleInputChange(e, 'end')}
               className={cn(
-                'border-inputfield-main focus:border-inputfield-focus hover:text-foreground h-full w-full justify-start rounded border bg-black py-[6.5px] pl-[6.5px] pr-[6.5px] text-left text-base font-normal hover:bg-black',
+                'border-inputfield-main focus:border-inputfield-focus hover:text-foreground h-full w-full justify-start rounded border bg-background py-[6.5px] pl-[6.5px] pr-[6.5px] text-left text-base font-normal hover:bg-background',
                 !end && 'text-muted-foreground'
               )}
               data-cy="input-date-range-end"
diff --git a/platform/ui-next/src/components/Dialog/Dialog.tsx b/platform/ui-next/src/components/Dialog/Dialog.tsx
index 58861d808..a76ab566f 100644
--- a/platform/ui-next/src/components/Dialog/Dialog.tsx
+++ b/platform/ui-next/src/components/Dialog/Dialog.tsx
@@ -54,7 +54,7 @@ const DialogOverlay = React.forwardRef<
   <div
     ref={ref}
     className={cn(
-      'data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 fixed inset-0 z-40 bg-black/60',
+      'data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 fixed inset-0 z-40 bg-background/60',
       className
     )}
     {...props}
diff --git a/platform/ui-next/src/components/LayoutSelector/LayoutSelector.tsx b/platform/ui-next/src/components/LayoutSelector/LayoutSelector.tsx
index 1cc051070..885c406e7 100644
--- a/platform/ui-next/src/components/LayoutSelector/LayoutSelector.tsx
+++ b/platform/ui-next/src/components/LayoutSelector/LayoutSelector.tsx
@@ -332,7 +332,7 @@ const GridSelector = ({ rows = 3, columns = 4, className }: GridSelectorProps) =
 };
 
 const Divider = ({ className }: { className?: string }) => (
-  <div className={cn('h-px bg-black', className)}></div>
+  <div className={cn('h-px bg-background', className)}></div>
 );
 
 const HelpText = ({ children, className }: { children: React.ReactNode; className?: string }) => (
diff --git a/platform/ui-next/src/components/NavBar/NavBar.tsx b/platform/ui-next/src/components/NavBar/NavBar.tsx
index f6fd0d67c..8d12b496d 100644
--- a/platform/ui-next/src/components/NavBar/NavBar.tsx
+++ b/platform/ui-next/src/components/NavBar/NavBar.tsx
@@ -17,7 +17,7 @@ const NavBar = ({
   return (
     <div
       className={classnames(
-        'bg-popover z-20 border-black px-1',
+        'bg-popover z-20 border-background px-1',
         isSticky && stickyClasses,
         !isSticky && notStickyClasses,
         className
diff --git a/platform/ui-next/src/components/OHIFDialogs/PresetDialog.tsx b/platform/ui-next/src/components/OHIFDialogs/PresetDialog.tsx
index 414a795c9..d57a06a7d 100644
--- a/platform/ui-next/src/components/OHIFDialogs/PresetDialog.tsx
+++ b/platform/ui-next/src/components/OHIFDialogs/PresetDialog.tsx
@@ -26,7 +26,7 @@ function PresetBody({ children, className }: PresetBodyProps) {
     <div
       className={cn(
         // Adjust these classes for your desired look
-        'border-foreground/10 flex min-h-0 flex-1 flex-col rounded-md border bg-black p-2',
+        'border-foreground/10 flex min-h-0 flex-1 flex-col rounded-md border bg-background p-2',
         className
       )}
     >
diff --git a/platform/ui-next/src/components/OHIFModals/ImageModal.tsx b/platform/ui-next/src/components/OHIFModals/ImageModal.tsx
index e4e56d232..9b04c8832 100644
--- a/platform/ui-next/src/components/OHIFModals/ImageModal.tsx
+++ b/platform/ui-next/src/components/OHIFModals/ImageModal.tsx
@@ -41,7 +41,7 @@ function ImageVisual({ children, className }: ImageVisualProps) {
   return (
     <div
       className={cn(
-        'flex-1 items-center justify-center rounded-2xl bg-black/80 p-4 sm:flex-[7]',
+        'flex-1 items-center justify-center rounded-2xl bg-background/80 p-4 sm:flex-[7]',
         'flex', // ensure the container is a flex box
         className
       )}
diff --git a/platform/ui-next/src/components/ProgressDropdown/ProgressDiscreteBar.tsx b/platform/ui-next/src/components/ProgressDropdown/ProgressDiscreteBar.tsx
index 4d31f7d31..b4c4c6770 100644
--- a/platform/ui-next/src/components/ProgressDropdown/ProgressDiscreteBar.tsx
+++ b/platform/ui-next/src/components/ProgressDropdown/ProgressDiscreteBar.tsx
@@ -10,7 +10,7 @@ const ProgressDiscreteBar = ({ options }: { options: ProgressDropdownOption[] })
         <div
           key={i}
           className={classnames('mr-1 h-1 grow first:rounded-l-sm last:mr-0 last:rounded-r-sm', {
-            'bg-black': !option.activated && !option.completed,
+            'bg-background': !option.activated && !option.completed,
             'bg-primary/40': option.activated && !option.completed,
             'bg-highlight': option.completed,
           })}
diff --git a/platform/ui-next/src/components/SidePanel/SidePanel.tsx b/platform/ui-next/src/components/SidePanel/SidePanel.tsx
index e5f832dfc..295cc0956 100644
--- a/platform/ui-next/src/components/SidePanel/SidePanel.tsx
+++ b/platform/ui-next/src/components/SidePanel/SidePanel.tsx
@@ -58,7 +58,7 @@ const closeIconWidth = 30;
 const gridHorizontalPadding = 10;
 const tabSpacerWidth = 2;
 
-const baseClasses = 'bg-black border-black justify-start box-content flex flex-col';
+const baseClasses = 'bg-background border-background justify-start box-content flex flex-col';
 
 const openStateIconName = {
   left: 'SidePanelCloseLeft',
@@ -447,7 +447,7 @@ const SidePanel = ({
         </div>
         <Separator
           orientation="horizontal"
-          className="bg-black"
+          className="bg-background"
           thickness="2px"
         />
       </>
diff --git a/platform/ui-next/src/components/StudyBrowserSort/StudyBrowserSort.tsx b/platform/ui-next/src/components/StudyBrowserSort/StudyBrowserSort.tsx
index ad41df99f..6f862c4fa 100644
--- a/platform/ui-next/src/components/StudyBrowserSort/StudyBrowserSort.tsx
+++ b/platform/ui-next/src/components/StudyBrowserSort/StudyBrowserSort.tsx
@@ -55,13 +55,13 @@ export function StudyBrowserSort({ servicesManager }: withAppTypes) {
       <DropdownMenu>
         <Tooltip>
           <TooltipTrigger className="w-full overflow-hidden">
-            <DropdownMenuTrigger className="border-input focus:border-input text-foreground flex h-[26px] w-full items-center justify-start overflow-hidden whitespace-nowrap rounded border bg-black p-2 text-base">
+            <DropdownMenuTrigger className="border-input focus:border-input text-foreground flex h-[26px] w-full items-center justify-start overflow-hidden whitespace-nowrap rounded border bg-background p-2 text-base">
               {selectedSort.label}
             </DropdownMenuTrigger>
           </TooltipTrigger>
           <TooltipContent>{selectedSort.label}</TooltipContent>
         </Tooltip>
-        <DropdownMenuContent className="bg-black">
+        <DropdownMenuContent className="bg-background">
           {sortFunctions.map(sort => (
             <DropdownMenuItem
               key={sort.label}
@@ -77,7 +77,7 @@ export function StudyBrowserSort({ servicesManager }: withAppTypes) {
         <TooltipTrigger>
           <button
             onClick={toggleSortDirection}
-            className="flex h-[26px] items-center justify-center bg-black"
+            className="flex h-[26px] items-center justify-center bg-background"
           >
             {sortDirection === 'ascending' ? (
               <Icons.SortingAscending className="text-primary w-2" />
diff --git a/platform/ui-next/src/components/StudyBrowserViewOptions/StudyBrowserViewOptions.tsx b/platform/ui-next/src/components/StudyBrowserViewOptions/StudyBrowserViewOptions.tsx
index 74ec12c3d..6fa531799 100644
--- a/platform/ui-next/src/components/StudyBrowserViewOptions/StudyBrowserViewOptions.tsx
+++ b/platform/ui-next/src/components/StudyBrowserViewOptions/StudyBrowserViewOptions.tsx
@@ -18,13 +18,13 @@ export function StudyBrowserViewOptions({ tabs, onSelectTab, activeTabName }: wi
     <DropdownMenu>
       <Tooltip>
         <TooltipTrigger className="w-full w-[50%] overflow-hidden">
-          <DropdownMenuTrigger className="border-input focus:border-input text-foreground flex h-[26px] w-full items-center justify-start rounded border bg-black p-2 text-base">
+          <DropdownMenuTrigger className="border-input focus:border-input text-foreground flex h-[26px] w-full items-center justify-start rounded border bg-background p-2 text-base">
             {activeTab?.label}
           </DropdownMenuTrigger>
         </TooltipTrigger>
         <TooltipContent>{activeTab?.label}</TooltipContent>
       </Tooltip>
-      <DropdownMenuContent className="bg-black">
+      <DropdownMenuContent className="bg-background">
         {tabs.map(tab => {
           const { name, label, studies } = tab;
           const isActive = activeTabName === name;
diff --git a/platform/ui-next/src/components/Thumbnail/Thumbnail.tsx b/platform/ui-next/src/components/Thumbnail/Thumbnail.tsx
index f7c70312b..d113b360c 100644
--- a/platform/ui-next/src/components/Thumbnail/Thumbnail.tsx
+++ b/platform/ui-next/src/components/Thumbnail/Thumbnail.tsx
@@ -67,7 +67,7 @@ const Thumbnail = ({
         )}
       >
         <div className="h-[114px] w-[128px]">
-          <div className="relative bg-black">
+          <div className="relative bg-background">
             {imageSrc ? (
               <img
                 src={imageSrc}
diff --git a/platform/ui-next/src/components/Viewport/ViewportPane.tsx b/platform/ui-next/src/components/Viewport/ViewportPane.tsx
index abf2cdf0c..d418380b9 100644
--- a/platform/ui-next/src/components/Viewport/ViewportPane.tsx
+++ b/platform/ui-next/src/components/Viewport/ViewportPane.tsx
@@ -58,7 +58,7 @@ function ViewportPane({
       onScroll={onInteractionHandler}
       onWheel={onInteractionHandler}
       className={classNames(
-        'group/pane relative h-full w-full overflow-hidden transition duration-300',
+        'group/pane relative h-full w-full overflow-hidden bg-black transition duration-300',
         className
       )}
       style={customStyle}
diff --git a/platform/ui-next/src/tailwind.css b/platform/ui-next/src/tailwind.css
index cb80fde07..926defb8c 100644
--- a/platform/ui-next/src/tailwind.css
+++ b/platform/ui-next/src/tailwind.css
@@ -12,7 +12,7 @@
     --neutral: 213 22% 59%;
     --neutral-light: 214 69% 81%;
     --neutral-dark: 214 16% 21%;
-    --background: 236 62% 5%;
+    --background: 0 0% 0%;
     --foreground: 0 0% 98%;
     --card: 234 64% 10%;
     --card-foreground: 0 0% 98%;
@@ -215,7 +215,7 @@
   }
 
   body {
-    @apply !bg-black;
+    @apply !bg-background;
   }
 }