fix small defects

platform/ui/src/components/ViewportGrid/ViewportGrid.jsx

@@ -9,7 +9,7 @@ const ViewportGrid = ({ rows, cols, viewportContents }) => {
       <div
         key={index}
         className={classnames(
-          'rounded-lg hover:border-primary-light transition duration-300 outline-none',
+          'rounded-lg hover:border-primary-light transition duration-300 outline-none overflow-hidden',
           {
             'border-2 border-primary-light -m-px': isActive,
             'border border-secondary-light': !isActive,