1button {
2  border: none;
3  display: block;
4  position: relative;
5  padding: 0.7em 2.4em;
6  font-size: 18px;
7  background: transparent;
8  cursor: pointer;
9  user-select: none;
10  overflow: hidden;
11  color: royalblue;
12  z-index: 1;
13  font-family: inherit;
14  font-weight: 500;
15}
16
17button span {
18  position: absolute;
19  left: 0;
20  top: 0;
21  width: 100%;
22  height: 100%;
23  background: transparent;
24  z-index: -1;
25  border: 4px solid royalblue;
26}
27
28button span::before {
29  content: "";
30  display: block;
31  position: absolute;
32  width: 8%;
33  height: 500%;
34  background: var(--lightgray);
35  top: 50%;
36  left: 50%;
37  transform: translate(-50%, -50%) rotate(-60deg);
38  transition: all 0.3s;
39}
40
41button:hover span::before {
42  transform: translate(-50%, -50%) rotate(-90deg);
43  width: 100%;
44  background: royalblue;
45}
46
47button:hover {
48  color: white;
49}
50
51button:active span::before {
52  background: #2751cd;
53}