<!DOCTYPE html>

<html>
  
  
<head>
     
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <meta http-equiv="X-UA-Compatible" content="ie=edge">
 
 <style>

body {
background: linear-gradient(-45deg, #FF0000, #FFFF00, #FF8000, #071918);
background-size: 400% 400%;
animation: gradient 15s ease infinite;
}

@keyframes gradient {
0% {
background-position: 0% 50%;
}
50% {
background-position: 100% 50%;
}
100% {
background-position: 0% 50%;
}
}
 </style>

</head>

<body>

 </body>
 
 </html>

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