Update index.html

index.html

@@ -30,7 +30,7 @@
  top: 0;
  width: 100%; /* Full width */
  height: 100%; /* Full height */
- overflow: hidden; /* Enable scroll if needed */
+ overflow: auto; /* Enable scroll if needed */
  background-color: rgb(0,0,0); /* Fallback color */
  background-color: rgba(0,0,0,0.9); /* Black w/ opacity */
 }