rendered html should be scrollable

www/render/index.html

@@ -14,11 +14,12 @@
             box-sizing: border-box;
             border: 1px solid blue;
             width: 100%;
-            height: 100vh;
+            height: 100%;
+            overflow: auto;
+
             font-size: 15px;
             top: 0px;
             left: 0px;
-            z-index: 10;
         }
     </style>
 </head>