1.wrap {
2  text-align: center;
3  margin: 20px 0;
4}
5
6.btn {
7  width: 100px;
8  height: 100px;
9  background: repeating-radial-gradient(circle at 50% 50%, rgba(200,200,200,.2) 0%, rgba(200,200,200,.2) 2%, transparent 2%, transparent 3%, rgba(200,200,200,.2) 3%, transparent 3%), conic-gradient(white 0%, silver 10%, white 35%, silver 45%, white 60%, silver 70%, white 80%, silver 95%, white 100%);
10  border-radius: 50%;
11  box-shadow: 0 0px 20px #0005, 0 -0px 20px #fff2;
12  outline: 1px solid #fff;
13  outline-offset: -2px;
14  transition: 1s;
15}
16
17.text {
18  font-size: 20px;
19  font-weight: 700;
20  color: #aaa;
21  text-align: center;
22  text-shadow: 1px 1px 1px #fff;
23}
24
25.btn:hover {
26  transform: rotate(90deg);
27}