1.link:after{
2 content: '';
3 position: absolute;
4 width: 0; height: 3px;
5 display: block;
6 margin-top: 5px;
7 right: 0;
8 background: #fff;
9 transition: width .2s ease;
10 -webkit-transition: width .2s ease;
11}
12
13.link:hover:after{
14 width: 100%;
15 left: 0;
16 background: #fff;
17}