1.btn {
2  font-size: 17px;
3  background: transparent;
4  border: none;
5  padding: 1em 1.5em;
6  color: #ffedd3;
7  text-transform: uppercase;
8  position: relative;
9  transition: .5s ease;
10}
11
12.btn::before {
13  content: '';
14  position: absolute;
15  left: 0;
16  bottom: 0;
17  height: 2px;
18  width: 0;
19  background-color: #ffc506;
20  transition: .5s ease;
21}
22
23.btn:hover {
24  color: #1e1e2b;
25  transition-delay: .5s;
26}
27
28.btn:hover::before {
29  width: 100%;
30}
31
32.btn::after {
33  content: '';
34  position: absolute;
35  left: 0;
36  bottom: 0;
37  height: 0;
38  width: 100%;
39  background-color: #ffc506;
40  transition: .4s ease;
41  z-index: -1;
42}
43
44.btn:hover::after {
45  height: 100%;
46  transition-delay: 0.4s;
47  color: aliceblue;
48}