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<style>
.cont{ width:500px; background: #101010; padding: 30px; }
.box {
position: relative;
width: 200px; height: 200px; color: blue;
background: #666666; border: 1px solid #5EF75E;
}
.box:before, .box:after{
content: ""; display: block; position: absolute;
width:220px; height:220px;
top: -10px; left: -10px; z-index:10;
border:2px solid #00FF00;
box-sizing: border-box;
-webkit-animation: clipAni 6s infinite linear;
}
.box:before { -webkit-animation-delay: -3s; }
@keyframes clipAni{
0%,100%{ clip:rect(0px,220px,220px,217px); }
25%{ clip:rect(0px,220px,3px,0px); }
50%{ clip:rect(0px,3px,220px,0px); }
75%{ clip:rect(217px,220px,220px,0px); }
}
</style>
<body>
<div class="cont">
<div class="box">内容展示区域</div>
</div>
</body>
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