diff --git a/public/index.html b/public/index.html
index e731511..fc89978 100644
--- a/public/index.html
+++ b/public/index.html
@@ -11,6 +11,7 @@
         font-size: calc(100vw/7.5);
         -webkit-text-size-adjust: 100%;
         height: 100%;
+        background-color: #F4F4F4;
       }
     </style>
     <script src="<%= BASE_URL %>api_address_config.js"></script>