css for pseudo elements wordpress

1#star-six {
2  width: 0;
3  height: 0;
4  border-left: 50px solid transparent;
5  border-right: 50px solid transparent;
6  border-bottom: 100px solid red;
7  position: relative;
8}
9#star-six:after {
10  width: 0;
11  height: 0;
12  border-left: 50px solid transparent;
13  border-right: 50px solid transparent;
14  border-top: 100px solid red;
15  position: absolute;
16  content: "";
17  top: 30px;
18  left: -50px;
19}