ohif-viewer/Packages/ohif-viewerbase/client/components/viewer/imageControls/imageControls.html

<template name="imageControls">
    <div class="imageControls">
        <div class="scrollbar">
            <input class="imageSlider" type="range" min="1" value="{{imageIndex}}" max="{{numImages}}"/>
        </div>
    </div>
</template>