holy-grail.css

html{
    background-color: black;
}
.container {
    display: grid;
    grid-template-areas:
      "header header header"
      "nav content side"
      "footer footer footer";
    grid-template-columns: 200px 1fr 200px;
    grid-template-rows: 110px 1fr 110px;
    grid-gap: 10px;
    height: 100vh;
    text-transform: uppercase;
    text-align: center;
    font-family: Arial, Helvetica, sans-serif;
    font-weight: bolder;
    font-size: 45px;
  }

  header {
    grid-area: header;
    background-color: #83caff;
  }
  
  nav {
    grid-area: nav;
    margin-left: 0.5rem;
    background-color: #cc99cc;
  }
  
  main {
    grid-area: content;
    background-color: #ffcccc;
  }
  
  aside {
    grid-area: side;
    margin-right: 0.5rem;
    background-color: #cc99cc;
  }
  
  footer {
    grid-area: footer;
    background-color: #83caff;
  }


  @media (max-width: 769px) {
    .container {
      font-size: 30px;
      grid-template-areas:
        "header"
        "nav"
        "content"
        "side"
        "footer";
  
      grid-template-columns: 1fr;
      grid-template-rows:
        110px /* Header */
        75px /* Menu */
        1fr /* Content */
        75px /* Sidebar */
        100px; /* Footer */
    }
  
    nav, aside {
      margin: 0;
    }
  }