1button {
2  padding: 10px 40px;
3  font-size: 18px;
4  background-color: #333;
5  color: #fff;
6  text-shadow: 0 2px 0 rgb(0 0 0 / 25%);
7  display: inline-flex;
8  align-items: center;
9  justify-content: center;
10  position: relative;
11  border: 0;
12  z-index: 1;
13  user-select: none;
14  cursor: pointer;
15  text-transform: uppercase;
16  letter-spacing: 1px;
17  white-space: unset;
18  padding: .8rem 1.5rem;
19  text-decoration: none;
20  font-weight: 900;
21  transition: all 0.7s cubic-bezier(0,.8,.26,.99);
22}
23
24button:before {
25  position: absolute;
26  pointer-events: none;
27  top: 0;
28  left: 0;
29  display: block;
30  width: 100%;
31  height: 100%;
32  content: '';
33  transition: .7s cubic-bezier(0,.8,.26,.99);
34  z-index: -1;
35  background-color: #333!important;
36  box-shadow: 0 -4px rgb(0 0 0 / 50%) inset, 0 4px rgb(255 255 255 / 20%) inset, -4px 0 rgb(255 255 255 / 20%) inset, 4px 0 rgb(0 0 0 / 50%) inset;
37}
38
39button:after {
40  position: absolute;
41  pointer-events: none;
42  top: 0;
43  left: 0;
44  display: block;
45  width: 100%;
46  height: 100%;
47  content: '';
48  box-shadow: 0 4px 0 0 rgb(0 0 0 / 15%);
49  transition: .7s cubic-bezier(0,.8,.26,.99);
50}
51
52button:hover:before {
53  box-shadow: 0 -4px rgb(0 0 0 / 50%) inset, 0 4px rgb(255 255 255 / 20%) inset, -4px 0 rgb(255 255 255 / 20%) inset, 4px 0 rgb(0 0 0 / 50%) inset;
54}
55
56button:hover:after {
57  box-shadow: 0 4px 0 0 rgb(0 0 0 / 15%);
58}
59
60button:active {
61  transform: translateY(4px);
62}
63
64button:active:after {
65  box-shadow: 0 0px 0 0 rgb(0 0 0 / 15%);
66}