body {
      font-family: Arial, sans-serif;
      margin: 0;
      padding: 0;
      background-color: #f4f4f4;
    }

    header {
      background: #35424a;
      color: #ffffff;
      padding: 20px 0;
      text-align: center;
    }

    nav ul {
      list-style: none;
      padding: 0;
    }

    nav ul li {
      display: inline;
      margin: 0 15px;
    }

    nav ul li a {
      color: #ffffff;
      text-decoration: none;
    }

    main {
      padding: 20px;
      text-align: center;
    }

    footer {
      text-align: center;
      padding: 10px 0;
      background: #35424a;
      color: #ffffff;
      position: absolute;
      width: 100%;
      bottom: 0;
    }