Nostalgia always work. Do you remember blue screens of death (BSOD)? A blue page happens when your (old) computer turned off suddenly because of deadly error. You can catch this idea and build a simple 404 not found page!
HTML
<!-- This script got from www.devanswer.com -->
<main class="bsod container">
<h1 class="neg title"><span class="bg">Error - 404</span></h1>
<p>An error has occured, to continue:</p>
<p>* Return to our homepage.<br />
* Send us an e-mail about this error and try later.</p>
<nav class="nav">
<a href="#" class="link">index</a> | <a href="#" class="link">webmaster</a>
</nav>
</main><div id="bcl"><a style="font-size:8pt;text-decoration:none;" href="http://www.devanswer.com">Developers Answer</a></div>
CSS
@import "https://fonts.googleapis.com/css?family=VT323";
body,
h1,
h2,
h3,
h4,
p,
a {
color: #e0e2f4;
}
body,
p {
font: normal 20px/1.25rem "VT323", monospace;
}
h1 {
font: normal 2.75rem/1.05em "VT323", monospace;
}
h2 {
font: normal 2.25rem/1.25em "VT323", monospace;
}
h3 {
font: lighter 1.5rem/1.25em "VT323", monospace;
}
h4 {
font: lighter 1.125rem/1.2222222em "VT323", monospace;
}
body {
background: #0414a7;
}
.container {
width: 90%;
margin: auto;
max-width: 640px;
}
.bsod {
padding-top: 10%;
}
.bsod .neg {
text-align: center;
color: #0414a7;
}
.bsod .neg .bg {
background: #aaaaaa;
padding: 0 15px 2px 13px;
}
.bsod .title {
margin-bottom: 50px;
}
.bsod .nav {
margin-top: 35px;
text-align: center;
}
.bsod .nav .link {
text-decoration: none;
padding: 0 9px 2px 8px;
}
.bsod .nav .link:hover, .bsod .nav .link:focus {
background: #aaaaaa;
color: #0414a7;
}