diff --git a/web/dev.ejs b/web/dev.ejs
index 76f1069c..025cd433 100644
--- a/web/dev.ejs
+++ b/web/dev.ejs
@@ -13,7 +13,13 @@
 
     .container {
       max-width: 800px;
-      margin: 40px;
+      margin: 5px;
+    }
+
+    @media (min-width: 768px) {
+      .container {
+        margin: 40px;
+      }
     }
   </style>
 </head>