body{
    font-family: serif;
}
  .toggle-btn {
    width: 40px;
    height: 25px;
    background-color: gray;
    border-radius: 15px;
    padding: 5px;
    
  }
  .toggle-btn > .inner-circle {
    width: 15px;
    height: 15px;
    background-color: #fff;
    border-radius: 50%;
    
  }
  .toggle-btn.active {
    background-color: #aa2bf3;
  }
  .toggle-btn.active > .inner-circle {
    margin-left: 17px;
  }