body {
      font-family: Arial, sans-serif;
      margin: 0; padding: 0;
      background: #f4f4f4;
    }
    header {
      background: #2c3e50;
      color: #fff;
      padding: 20px;
      text-align: center;
    }
    .container {
      text-align: center;
      padding: 50px;
    }
    button {
      padding: 12px 25px;
      background: #3498db;
      color: white;
      border: none;
      border-radius: 5px;
      cursor: pointer;
      font-size: 16px;
    }
    button:hover {
      background: #2980b9;
    }
    /* Modal */
    .modal {
      display: none; 
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background: rgba(0,0,0,0.5);
      justify-content: center;
      align-items: center;
    }
    .modal-content {
      background: #fff;
      padding: 20px;
      border-radius: 10px;
      width: 400px;
      max-height: 90%;
      overflow-y: auto;
    }
    .form-group {
      margin-bottom: 15px;
      text-align: left;
    }
    .form-group label {
      display: block;
      margin-bottom: 5px;
      font-weight: bold;
    }
    .form-group input, .form-group select {
      width: 100%;
      padding: 8px;
      border: 1px solid #ccc;
      border-radius: 5px;
    }
    .close {
      float: right;
      cursor: pointer;
      font-size: 20px;
      font-weight: bold;
      color: #333;
    }