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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Animated pseudo elements</title>
<style>
html, body {
margin: 0;
height: 100%;
width: 100%;
overflow: hidden;
display: flex;
justify-content: center;
align-items: flex-end;
}
body {
animation: color 2s linear infinite;
background: #333;
}
@keyframes color {
to {
filter: hue-rotate(360deg);
}
}
body::before,
body::after {
content: "";
flex-grow: 1;
height: 100%;
animation: grow 1s linear infinite alternate;
}
body::before {
background: hsl(120, 80%, 80%);
}
body::after {
background: hsl(240, 80%, 80%);
animation-delay: -.5s;
}
@keyframes grow {
0% {height: 100%; animation-timing-function: ease-in-out;}
10% {height: 80%; animation-timing-function: ease-in-out;}
20% {height: 60%; animation-timing-function: ease-in-out;}
30% {height: 70%; animation-timing-function: ease-in-out;}
40% {height: 50%; animation-timing-function: ease-in-out;}
50% {height: 30%; animation-timing-function: ease-in-out;}
60% {height: 80%; animation-timing-function: ease-in-out;}
70% {height: 90%; animation-timing-function: ease-in-out;}
80% {height: 70%; animation-timing-function: ease-in-out;}
90% {height: 60%; animation-timing-function: ease-in-out;}
100% {height: 100%; animation-timing-function: ease-in-out;}
}
</style>
</head>
<body>
</body>
</html>
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