Circle button css

For div tag there is already default property display:block given by browser. For anchor tag there is not display property given by browser. You need to add display property to it. That’s why use display:block or display:inline-block. It will work.

.btn {
  display:block;
  height: 300px;
  width: 300px;
  border-radius: 50%;
  border: 1px solid red;
  
}

<a class="btn" href="#"><i class="ion-ios-arrow-down"></i></a>