Question

如何利用CSS3 逐渐发光的方格边框

Answer 1

一个使用伪元素来实现边框逐渐发光的代码，主要用到scale和opacity这两个属性。
Html代码
<div>
<img src="http://tva2.sinaimg.cn/crop.0.0.180.180.180/6830a53bjw8f2qo4xzc2zj20500500t0.jpg"/>
<div>
<p>CSS3 逐渐发光的方格边框</p>
<p>CSS3 逐渐发光的方格边框</p>
</div>
</div>
Css代码
.light{
background: #fff;
width: 180px;
height: 180px;
margin: 100px auto;
position: relative;
text-align: center;
color: #333;
transform:translate3d(0,0,0);

}
.light-inner{
padding: 60px 30px 0;
pointer-events: none;
position: absolute;
left: 0;
top: 0;
bottom: 0;
right: 0;
text-align: center;
transition: background 0.35s;
backface-visibility: hidden;
}
.light-inner:before, .light-inner:after{
display: block;
content: "";
position: absolute;
left: 30px;
top: 30px;
right: 30px;
bottom: 30px;
border: 1px solid #fff;
opacity: 0;
transition: opacity 0.35s, transform 0.35s;
}
.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, transform 0.35s;
transform: translate3d(0,20px,0);
color: #fff;
opacity: 0;
line-height: 30px;
}
.light:hover .light-inner p{
transform: translate3d(0,0,0);
opacity: 1;
}