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

    body, html {
      height: 100%;
      font-family: Arial, sans-serif;
    }

    /* Layout */
    body {
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

    header, footer {
      background-color: #333;
      color: #fff;
      padding: 1rem;
      text-align: center;
    }

    main {
      flex: 1; /* Ocupa todo el espacio restante */
      background-color: #f4f4f4;
      padding: 1rem;
      display: flex;
      justify-content: center;
      align-items: center;
      text-align: center;
    }