body{

    display: flex;
    justify-content: center;
    margin-top: 50px;
  
  }
  
  .popover {
    display: none;
    position: absolute;
    width: 250px;
    padding: 10px;
    border-radius: 10px;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    z-index: 1;
    font-size: 16px;
    line-height: 1.5;
    text-align: center;
  }

  .popover.active{
    display: block;
  }

  .btn {
    display: inline-block;
    padding: 10px;
    border-radius: 5px;
    background-color: #3f51b5;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
  }
  
  .btn:hover {
    background-color: #303f9f;
  }