diff --git a/src/pages/Viewer.tsx b/src/pages/Viewer.tsx
index 7e12104..4cb3b0c 100644
--- a/src/pages/Viewer.tsx
+++ b/src/pages/Viewer.tsx
@@ -364,7 +364,7 @@ const Viewer = () => {
 
       <div className="flex flex-1 overflow-hidden">
         {/* 3D Canvas with floating controls */}
-        <div className="relative flex-1" id="canvas-container">
+        <div className="relative flex-1 min-w-0" id="canvas-container">
           <ModelViewerCanvas />
           {isFullscreen ? (
             <div className="absolute top-4 left-4 z-50 flex gap-2">