#messageBar {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      padding: 12px 20px;
      color: white;
      font-weight: bold;
      text-align: center;
      z-index: 9999;
      transition: all 0.3s ease;
    }
    #messageBar.success {
      background-color: #28a745; /* Green */
    }
    #messageBar.error {
      background-color: #dc3545; /* Red */
    }
    #messageBar.warning {
      background-color: #ffc107; /* Yellow */
    }
    #messageBar.info {
      background-color: #17a2b8; /* Blue */
    }