Button by mi-series

1button {
2  width: 150px;
3  height: 50px;
4  border: 2px solid #000;
5  font-family: 'Lato', sans-serif;
6  font-size: 17px;
7  text-decoration: none;
8  text-transform: uppercase;
9  letter-spacing: 2px;
10  font-weight: 500;
11  background: transparent;
12  cursor: pointer;
13  position: relative;
14  display: inline-block;
15  margin: 20px;
16  outline: none;
17  text-align: center;
18  z-index: 2;
19  transition: all 0.3s ease;
20  overflow: hidden;
21}
22
23button::after {
24  position: absolute;
25  content: " ";
26  z-index: -1;
27  top: 0;
28  left: 0;
29  width: 100%;
30  height: 100%;
31  transition: all 0.3s ease;
32}
33
34button:hover {
35  box-shadow: 4px 4px 6px 0 rgba(255,255,255,.5),
36              -4px -4px 6px 0 rgba(116, 125, 136, .2), 
37    inset -4px -4px 6px 0 rgba(255,255,255,.5),
38    inset 4px 4px 6px 0 rgba(116, 125, 136, .3);
39  color: #fff;
40}
41
42button:hover::after {
43  transform: scale(2) rotate(180deg);
44  background: #000;
45  box-shadow: 4px 4px 6px 0 rgba(255,255,255,.5),
46              -4px -4px 6px 0 rgba(116, 125, 136, .2), 
47    inset -4px -4px 6px 0 rgba(255,255,255,.5),
48    inset 4px 4px 6px 0 rgba(116, 125, 136, .3);
49}