1.main {
2  display: flex;
3  align-items: center;
4  justify-content: center;
5}
6
7.btn {
8  width: 170px;
9  height: 60px;
10  font-size: 18px;
11  background: #fff;
12  border: none;
13  border-radius: 50px;
14  color: #000;
15  outline: none;
16  cursor: pointer;
17  transition: all 0.4s;
18}
19
20.btn:hover {
21  box-shadow: inset 0 0 0 4px #ef476f, 
22              inset 0 0 0 8px #ffd166, 
23              inset 0 0 0 12px #06d6a0,
24              inset 0 0 0 16px #118ab2;
25  background: #073b4c;
26  color: #fff;
27}