make a circle in css

    #circle {
      width: 100px;
      height: 100px;
      background: red;
      border-radius: 50%
    }
  

#div2{
    width: 150px;
    height: 150px;
    border: 3px solid #05ffb0;
    border-radius: 50%;
    padding: 20px;
    text-align: center;
}