circle button html

1.btn {
2  display:block;
3  height: 300px;
4  width: 300px;
5  border-radius: 50%;
6  border: 1px solid red;
7  
8}

1.btn {
2  height: 300px;
3  width: 300px;
4  border-radius: 50%;
5  border: 1px solid red;
6}