round button css

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

.btn{
    border: none;
    padding: 7px 26px;
    text-align: center;
    color: white;
    background: #dc3545;
    border-radius: 40px;
}

.rounded-corners {
  border-radius: 5px;
}