diff --git a/components/tracks/TrackList.tsx b/components/tracks/TrackList.tsx
index e844efd..93d4ce2 100644
--- a/components/tracks/TrackList.tsx
+++ b/components/tracks/TrackList.tsx
@@ -100,7 +100,7 @@ export function TrackList({
       {/* Track List - Two Column Layout */}
       <div className="flex-1 flex overflow-hidden">
         {/* Left Column: Track Controls (Fixed Width, No Scroll - synced with waveforms) */}
-        <div ref={controlsScrollRef} className="w-48 flex-shrink-0 overflow-hidden pb-3">
+        <div ref={controlsScrollRef} className="w-48 flex-shrink-0 overflow-hidden pb-3 border-r border-border">
           {tracks.map((track) => (
             <Track
               key={track.id}