diff --git a/index.html b/index.html
index 3456a20..072a906 100644
--- a/index.html
+++ b/index.html
@@ -70,7 +70,14 @@
 
         .game {
             width: 600px;
-            height: 600px;
+            aspect-ratio: 1/1;
+        }
+
+        @media (max-width: 768px) {
+            .game {
+                width: 80%;
+                aspect-ratio: 1/1;
+            }
         }
     </style>
 </head>