* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: 'Roboto', sans-serif;
    }

    body {
      display: flex;
      flex-direction: column;
      background-color: #f4f4f4;
    }

    .menu-toggle {
      display: none;
      background-color: #ff6600;
      color: white;
      font-size: 20px;
      padding: 10px 20px;
      border: none;
      width: 100%;
      text-align: left;
      z-index: 999;
    }

    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      height: 100vh;
      width: 300px;
      background-color: #ccc;
      padding: 15px 20px;
      overflow-y: auto;
      border-right: 2px solid #bbb;
      transition: all 0.3s ease;
      z-index: 998;
    }

    .nav-container a {
      color: black;
      font-size: 20px;
      text-decoration: none;
      padding: 12px;
      display: block;
      transition: 0.3s;
      border-bottom: 1px solid #aaa;
    }

    .nav-container a:hover,
    .nav-container a:active {
      background-color: #ff6600;
      color: white;
      border-radius: 5px;
    }

    .nav-menu {
      list-style: none;
      padding-left: 0;
      width: 100%;
    }

    .dropdown-menu {
      display: none;
      background-color: #ddd;
      list-style: none;
      padding-left: 15px;
      border-left: 2px solid #bbb;
    }

    .dropdown-menu a {
      padding: 8px;
      display: block;
      color: black;
      border-bottom: 1px solid #bbb;
    }

    .dropdown-menu a:hover {
      background-color: #ff6600;
      color: white;
      border-radius: 5px;
    }

    .dropdown.open .dropdown-menu {
      display: block;
    }

    .main-content {
      margin-left: 300px;
      padding: 2px;
      width: calc(100% - 320px);
      margin-top: 5px;
      background-color: #ffe5b4;
      border-radius: 8px;
      box-shadow: 0px 2px 8px rgba(0, 0, 0, 0.2);
      text-align: center;
      transition: margin-left 0.3s ease;
    }
 #welcome-message {
    font-size: 30px;
    font-weight: bold;
    color: #333;
    margin: 20px auto;
    width: fit-content;
    animation: slideIn 2s ease-out forwards;
    opacity: 0;
    transform: translateX(-100%);
  }

  @keyframes slideIn {
    0% {
      opacity: 0;
      transform: translateX(-100%);
    }
    100% {
      opacity: 1;
      transform: translateX(0);
    }
  }

    iframe {
      width: 100%;
      height: 85vh;
      border: none;
      background-color: white;
      display: none;
      border-radius: 8px;
    }

    .error-message {
      display: none;
      color: red;
      font-size: 18px;
      text-align: center;
      padding: 20px;
    }

    @media screen and (max-width: 768px) {
      .menu-toggle {
        display: block;
        position: relative;
      }

      .navbar {
        display: none;
        width: 100%;
        height: auto;
        position: relative;
      }

      .navbar.active {
        display: block;
      }

      .main-content {
        margin-left: 0;
        width: 100%;
        margin-top: 20px;
      }

      iframe {
        height: 75vh;
      }
    }