box-shadow animation

1* {
2  padding: 0;
3  margin: 0;
4}
5
6body {
7  height: 100%;
8  font-size: 16px;
9  background-color: black;
10}
11
12body::before {
13  content: "";
14  width: 2px;
15  height: 2px;
16  border-radius: 50%;
17  position: absolute;
18  background-color: hsl(90, 100%, 50%);
19  -webkit-animation: testAnimacion 5s ease-in-out infinite alternate-reverse;
20  animation: testAnimacion 5s ease-in-out infinite alternate-reverse;
21}