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<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="styles.css">
</head>
<body>
<div class="background"></div>
</body>
</html>
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@keyframes gradient {
0% {
background-position: 0% 50%;
}
50% {
background-position: 100% 50%;
}
100% {
background-position: 0% 50%;
}
}
body{
width: 100vw;
height: 100vh;
}
div{
transition: all .3s ease-in-out;
background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
background-size: 400% 400%;
animation: gradient 15s ease infinite;
height: 500px;
width: 500px;
}
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<video id="video" autoplay="true" loop muted>
<source src="background.mp4" type="video/mp4"/>
</video>