用CSS3来实现逐渐发光的方格边框

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.light{

 background:#fff;

 width:180px;

 height:180px;

 margin:100pxauto;

 position:relative;

 text-align:center;

 color:#333;

 transform:translate3d(0,0,0);

}

.light-inner{

 padding:60px30px0;

 pointer-events:none;

 position:absolute;

 left:0;

 top:0;

 bottom:0;

 right:0;

 text-align:center;

 transition: background0.35s;

 backface-visibility:hidden;

}

.light-inner:before, .light-inner:after{

 display:block;

 content:"";

 position:absolute;

 left:30px;

 top:30px;

 right:30px;

 bottom:30px;

 border:1pxsolid#fff;

 opacity:0;

 transition: opacity0.35s, transform0.35s;

}

.light-inner:before{

 border-left:0;

 border-right:0;

 transform:scaleX(0,1);

}

.light-inner:after{

 border-top:0;

 border-bottom:0;

 transform: scaleY(1,0);

}

.light:hover .light-inner{

 background:#458fd2

}

.light:hover .light-inner:before, .light:hover .light-inner:after{

 opacity:1;

 transform: scale3d(1,1,1);

}

.light-inner p{

 transition: opacity .35s, transform0.35s;

 transform: translate3d(0,20px,0);

 color:#fff;

 opacity:0;

 line-height:30px;

}

.light:hover .light-inner p{

 transform: translate3d(0,0,0);

 opacity:1;

}