body {
      font-family: Arial, sans-serif;
      margin: 0;
      display: grid;
      grid-template-areas: 
        "header header"
        "nav nav"
        "aside main"
        "footer footer";
      grid-template-columns: 250px 1fr;
      grid-template-rows: auto auto 1fr auto;
      height: 100vh;
    }
    header {
      grid-area: header;
      background-color: #333;
      color: white;
      padding: 1em;
      text-align: center;
    }
    nav {
      grid-area: nav;
      background-color: #444;
      color: white;
      padding: 1em;
      text-align: center;
    }
    aside {
      grid-area: aside;
      background-color: #f4f4f4;
      padding: 1em;
    }
    main {
      grid-area: main;
      padding: 1em;
      background-color: #fff;
    }
    section {
      margin-bottom: 1em;
      padding: 1em;
      background-color: #eaeaea;
    }
    footer {
      grid-area: footer;
      background-color: #333;
      color: white;
      text-align: center;
      padding: 1em;
    }