#success-message {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: #28a745;
    color: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    font-size: 18px;
    text-align: center;
    z-index: 10000;
    opacity: 0;
    transition: opacity 0.5s ease;
  }
  #success-message.show {
    display: block;
    opacity: 1;
  }