1.click {
2  margin: 2rem auto;
3  display: flex;
4  background-color: #7A5FFF;
5  color: white;
6  cursor: pointer;
7  border: none;
8  font-size: 1.2rem;
9  padding: 10px 15px;
10  border-radius: .25rem
11}
12
13.click {
14  transition: background .8s ease-out;
15  background: #7A5FFF radial-gradient(circle, transparent 1%, #7A5FFF 1%) center/15000%;
16}
17
18.click:active {
19  background-color: #c1b4ff;
20  background-size: 100%;
21  transition: background 0s;
22}
23