diff --git a/docs/index.html b/docs/index.html
index 367bb80a30b26dbf878276185a07db223eb82d50..0c27050122389d760e27a9c788e739ac2305dd18 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -8,6 +8,13 @@
   <meta name="description" content="Description">
   <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
   <link rel="stylesheet" href="//jsd-proxy.ygxz.in/npm/docsify/lib/themes/vue.css">
+  <style>
+    img {
+      display: block;
+      max-width: min(480px, 100%);
+      margin: 0 auto;
+    }
+  </style>
 </head>
 <body>
   <div id="app"></div>
