index.html

 1<html><head><link rel="stylesheet" href="resource://content-accessible/plaintext.css"></head><body><pre>Cannot GET /</pre><style type="text/css">
 2    html:before {
 3        z-index: -2147483646;
 4    }
 5html:before {
 6background: rgba(255,0,0,1);
 7opacity: 0.75;
 8transition:  opacity 0.85s ease-out;
 9position: fixed;
10content: "";
11z-index: 2147483647;
12top: 0;
13left: 0;
14height: 2px;
15}</style></body></html>