1.main {
2 display: flex;
3 align-items: center;
4 justify-content: center;
5 height: 100vh;
6}
7
8.btn {
9 width: 170px;
10 height: 60px;
11 font-size: 18px;
12 background: #fff;
13 border: none;
14 border-radius: 50px;
15 color: #000;
16 outline: none;
17 cursor: pointer;
18 transition: all 0.4s;
19}
20
21.btn:hover {
22 box-shadow: inset 0 0 0 4px #ef476f, 
23              inset 0 0 0 8px #ffd166, 
24              inset 0 0 0 12px #06d6a0,
25              inset 0 0 0 16px #118ab2;
26 background: #073b4c;
27 color: #fff;
28}