1.button {
2  text-decoration: none;
3  padding: 14px 24px;
4  color: #121212;
5  border: 1px solid #181818;
6  overflow: hidden;
7  position: relative;
8  transition: color .5s .25s;
9  border-radius: 2px;
10  background: transparent;
11}
12
13.button::before,
14.button::after {
15  content: '';
16  position: absolute;
17  top: 0;
18  width: 50%;
19  height: 100%;
20  background-color: #181818;
21  z-index: -1;
22  transform: scaleX(0);
23  transition: transform .5s cubic-bezier(.785, .135, .15, .86);
24}
25
26.button::before {
27  left: 0;
28  transform-origin: left;
29}
30
31.button::after {
32  right: 0;
33  transform-origin: right;
34}
35
36.button:hover::before,
37.button:hover::after {
38  transform: scaleX(1);
39}
40
41.button:hover {
42  color: #f8f8f8;
43  transition-delay: .5s;
44}