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这个要运用的新知识如下：
复制代码 代码如下:
//css3新知识
display: flex;
justify-content: center;
align-items: center;
animation: shadow .5s linear infinite;
@keyframes shadow {
0%, 100% {transform: scaleX(1);}
50% {transform: scaleX(1.2);}
}
::after 需要加定位，宽度才好使
实例代码如下
复制代码 代码如下:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
body{
background:#bbd149;
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);}
}</p>
<p>@keyframes rotate {
0% {
transform: translateY(0) rotate(0deg);
}
25% {
transform: translateY(10px) rotate(22.5deg);
}
50% {
transform: translateY(20px) scale(1.1, 0.9) rotate(45deg);
border-bottom-right-radius: 50px;
}
75% {
ransform: translateY(10px) rotate(67.5deg);
}
100% {
transform: translateY(0) rotate(90deg);
}
}
</style>
</head></p>
<p><body>
<div>
</div>
</body>
</html>
（编辑：ASP站长网）
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