making a circle css

1
2    #circle {
3      width: 100px;
4      height: 100px;
5      background: red;
6      border-radius: 50%
7    }
8  

1#circle {
2  width: 100px;
3  height: 100px;
4  background: red;
5  border-radius: 50%
6}
7

1#circle {
2  width: 100px;
3  height: 100px;
4  background: red;
5  border-radius: 50%
6}

1<div id="circle">
2</div>
3
4#circle {
5    width: 100px;
6    height: 100px;
7    background: red;
8    border-radius: 50%
9}