* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html, body {
            height: 100%;
        }

        body {
            font-family: Arial, sans-serif;
            background: #f4f4f4;
            display: flex;
            flex-direction: column;
            min-height: 100vh;
        }

        header {
      background-color: #222;
      color: white;
      padding: 1rem 2rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    header h1 {
      margin: 0;
      font-size: 1.8rem;
    }

    nav a {
      color: white;
      text-decoration: none;
      margin-left: 1.5rem;
      font-weight: bold;
    }

        main {
            flex-grow: 1;
            padding: 20px;
        }

        h2 {
            text-align: center;
            color: red;
        }

        form {
            text-align: center;
            margin-bottom: 20px;
        }

        table {
            width: 90%;
            margin: auto;
            border-collapse: collapse;
            background: white;
        }

        th, td {
            padding: 10px;
            border: 1px solid #ccc;
            text-align: center;
            font-size: 14px;
        }

        th {
            background-color: #333;
            color: white;
        }

        tr:nth-child(even) {
            background-color: #f9f9f9;
        }

        footer {
            background-color: #222;
            color: #ccc;
            text-align: center;
            padding: 1rem;
        }
  .dropdown {
    display: inline-block;
    position: relative;
  }

  .dropdown-content {
    display: none;
    position: absolute;
    background-color: #1e1e1e;
    min-width: 160px;
    z-index: 1;
    border-radius: 5px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
  }

  .dropdown-content a {
    display: block;
    padding: 10px;
    color: white;
    text-decoration: none;
  }

  .dropdown-content a:hover {
    background-color: #333;
  }