.whatsapp-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: #25D366;
    color: #fff;
    text-decoration: none;
    width: 65px;
    height: 65px;
    border-radius: 50%;
    transition: background-color 0.3s ease;
  }
  
  .whatsapp-btn i {
    font-size: 28px;
  }