1.btn {
2  position: absolute;
3  top: 50%;
4  left: 50%;
5  transform: translate(-50%, -50%);
6  font-size: 25px;
7  font-weight: 600;
8  height: 40px;
9  line-height: 40px;
10  cursor: pointer;
11  background-color: inherit;
12  border: none;
13  outline: none;
14  color: #f1f1f1;
15}
16
17.btn:hover .background {
18  height: inherit;
19  width: 120%;
20  top: 50%;
21}
22
23.btn .background {
24  position: absolute;
25  top: 100%;
26  left: 50%;
27  transform: translate(-50%, -50%);
28  height: 3px;
29  width: 100%;
30  background-color: #006b92;
31  z-index: -1;
32  border-radius: 5px;
33  transition: all 0.3s;
34}