试着用CSS3实现元素跳动的动画效果，已经快下班了，直接上干货，代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>简单元素跳动效果</title>
<style>
body{
background:#ccc;
margin: 0;
height: 100vh;
display: flex;
justify-content: center;
align-items: center;
}
.box{
height: 50px;
width: 50px;
position: relative;
}
.box::before{
content: '';
height: 8px; width: 50px; background: #000; opacity: .2; border-radius: 50%;
position: absolute;
top: 67px;
left: 0;
animation: shadow .5s linear infinite;
}
.box::after{
border-radius: 5px;
background: #fff;
animation: rotate .5s linear infinite;
content: '';
position: absolute;
left: 0;
top: 0;
width: 50px;
height: 50px;
}
@keyframes shadow {
0%, 100% {transform: scaleX(1);}
50% {transform: scaleX(1.2);}
}
@keyframes rotate {
0% {
transform: translateY(0) ;
}
25% {
transform: translateY(10px);
}
50% {
transform: translateY(20px) scale(1.1, 0.9);
}
75% {
ransform: translateY(10px) ;
}
100% {
transform: translateY(0) ;
}
}
</style>
</head>
<body>
<div class="box"></div>
</body>
</html> 
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