背景动画
作者：互联网
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>demo</title>
<style>
.shadow {
position: relative;
width: 250px;
height: 250px;
border: 1px solid #333;
box-sizing: border-box;
margin: 50px;
float: left;
overflow: hidden;
}
.shadow::before {
content: "";
position: absolute;
width: 50px;
height: 50px;
top: -50px;
left: -50px;
box-shadow: 50px 50px, 150px 50px, 250px 50px, 50px 100px, 150px 100px, 250px 100px, 50px 150px, 150px 150px, 250px 150px, 50px 200px, 150px 200px, 250px 200px, 50px 250px, 150px 250px, 250px 250px;
animation: move 3s infinite linear;
}
@keyframes move {
25% {
transform: translate(50px);
color: coral;
box-shadow: 50px 50px, 150px 50px, 250px 50px, 50px 100px, 150px 100px, 250px 100px, 50px 150px, 150px 150px, 250px 150px, 50px 200px, 150px 200px, 250px 200px, 50px 250px, 150px 250px, 250px 250px;
}
50% {
transform: translate(0px);
color: brown;
border-radius: 0;
box-shadow: 50px 50px, 150px 50px, 250px 50px, 100px 100px, 200px 100px, 300px 100px, 50px 150px, 150px 150px, 250px 150px, 100px 200px, 200px 200px, 300px 200px, 50px 250px, 150px 250px, 250px 250px;
}
75% {
transform: translate(0px);
color: teal;
border-radius: 50%;
box-shadow: 50px 50px, 150px 50px, 250px 50px, 100px 100px, 200px 100px, 300px 100px, 50px 150px, 150px 150px, 250px 150px, 100px 200px, 200px 200px, 300px 200px, 50px 250px, 150px 250px, 250px 250px;
}
100% {
border-radius: 0%;
box-shadow: 50px 50px, 150px 50px, 250px 50px, 50px 100px, 150px 100px, 250px 100px, 50px 150px, 150px 150px, 250px 150px, 50px 200px, 150px 200px, 250px 200px, 50px 250px, 150px 250px, 250px 250px;
}
}
</style>
</head>
<body>
<div class="shadow"></div>
</body>
</html>
标签：动画,250px,50px,100px,背景,shadow,200px,150px 来源： https://www.cnblogs.com/MarHangover/p/15834845.html