diff --git a/index.html b/index.html
index 5a04747..366bda6 100644
--- a/index.html
+++ b/index.html
@@ -40,6 +40,7 @@
 
             /* Simplified scaling: Aspect ratio determines size, strictly contained */
             width: calc(100% - 500px);
+            min-width: 640px;
             height: auto;
             aspect-ratio: 4 / 3;
         }