diff --git a/apps/desktop/src/pages/Viewer/index.tsx b/apps/desktop/src/pages/Viewer/index.tsx
index a24210a..bb787ef 100644
--- a/apps/desktop/src/pages/Viewer/index.tsx
+++ b/apps/desktop/src/pages/Viewer/index.tsx
@@ -328,8 +328,8 @@ export const Viewer = () => {
           </ResizablePanel>
           <ResizableHandle withHandle />
           <ResizablePanel defaultSize={50}>
-            <div className="w-full h-1/3" ref={volumeViewport1Ref} />
-            <div className="w-full h-1/3" ref={volumeViewport2Ref} />
+            <div className="w-full h-1/3 border-b border-1 border-secondary" ref={volumeViewport1Ref} />
+            <div className="w-full h-1/3 border-b border-1 border-secondary" ref={volumeViewport2Ref} />
             <div className="w-full h-1/3" ref={volumeViewport3Ref} />
           </ResizablePanel>
         </ResizablePanelGroup>