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Source Code
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<!-- This script got from www.devanswer.com -->
<style>
#oopss {
background: linear-gradient(-45deg, #fff300, #efe400);
position: fixed;
left: 0px;
top: 0;
width: 100%;
height: 100%;
line-height: 1.5em;
z-index: 9999;
}
#oopss #error-text {
font-size: 40px;
display: flex;
flex-direction: column;
align-items: center;
font-family: 'Shabnam', Tahoma, sans-serif;
color: #000;
direction: rtl;
}
#oopss #error-text img {
margin: 85px auto 20px;
height: 342px;
}
#oopss #error-text span {
position: relative;
font-size: 3.3em;
font-weight: 900;
margin-bottom: 50px;
}
#oopss #error-text p.p-a {
font-size: 19px;
margin: 30px 0 15px 0;
}
#oopss #error-text p.p-b {
font-size: 15px;
}
#oopss #error-text .back {
background: #fff;
color: #000;
font-size: 30px;
text-decoration: none;
margin: 2em auto 0;
padding: .7em 2em;
border-radius: 500px;
box-shadow: 0 20px 70px 4px rgba(0, 0, 0, 0.1), inset 7px 33px 0 0px #fff300;
font-weight: 900;
transition: all 300ms ease;
}
#oopss #error-text .back:hover {
-webkit-transform: translateY(-13px);
transform: translateY(-13px);
box-shadow: 0 35px 90px 4px rgba(0, 0, 0, 0.3), inset 0px 0 0 3px #000;
}
</style>
</head>
<body>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css">
<div id='oopss'>
<div id='error-text'>
<img src="http://www.devanswer.com/img/sad404.svg" alt="404">
<span>404 PAGE</span>
<p class="p-a">
. The page you were looking for could not be found</p>
<p class="p-b">
... Back to previous page
</p>
<a href='#' class="back">... Back to previous page</a>
</div>
</div><div id="bcl"><a style="font-size:8pt;text-decoration:none;" href="http://www.devanswer.com">Developers Answer</a></div>
</body>
</html>