css-div边框动画

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        body{
            background:#000;
        }
        .wrap{
            widows: 840px;
            margin:50px auto;
            height:300px;
        }
        .wrap a {
            float:left;
            width: 180px;
            height:180px;
            margin:10px;
            border:2px solid #ccc;
            position: relative;
        }
        .wrap a .top{
            display:inline-block;
            position: absolute;
            left:-2px;
            top:-2px;
            width: 0px;
            height:2px;
            background:#ff0000;
            transition:.5s;
        }
        .wrap a .right{
            display:inline-block;
            position: absolute;
            right:-2px;
            bottom:0;
            width: 2px;
            height:0;
            background:#ff0000;
            transition:.5s;
        }
        .wrap a .bottom{
            display:inline-block;
            position: absolute;
            right:-2px;
            bottom:-2px;
            width: 0;
            height:2px;
            background:#ff0000;
            transition:.5s;
        }
        .wrap a .left{
            display:inline-block;
            position: absolute;
            left:-2px;
            top:0;
            width: 2px;
            height:0;
            background:#ff0000;
            transition:.5s;
        }
        .wrap a:hover .top,.wrap a:hover .bottom{
            width:102%;
            transition: .5s;
        }
        .wrap a:hover .right, .wrap a:hover .left{
            height:101%;
            transition: .5s
        }
    </style>
</head>
<body>
    <div class="wrap">
        <a href="#">
            <span class="top"></span>
            <span class="right"></span>
            <span class="bottom"></span>
            <span class="left"></span>            
        </a>
        <a href="#">
            <span class="top"></span>
            <span class="right"></span>
            <span class="bottom"></span>
            <span class="left"></span>            
        </a>
        <a href="#">
            <span class="top"></span>
            <span class="right"></span>
            <span class="bottom"></span>
            <span class="left"></span>            
        </a>
        <a href="#">
            <span class="top"></span>
            <span class="right"></span>
            <span class="bottom"></span>
            <span class="left"></span>            
        </a>
    </div>
</body>
</html>
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