div.main-body {
    display: grid;
    grid-template-columns: minmax(300px, auto)1fr;
    grid-template-areas: "navbar mainContent";
    grid-gap: 20px;
}





nav#navbar {
    background-color: white;
    width: 250px;
}



nav#navbar a {
    display: block;
    border: 1px solid black;
    padding: 5px;
    margin: 10px 0;
    text-decoration: none;
    color: black;
}

main#main-doc {
    grid-area: mainContent;
}

header {
    font-size: 1.5rem;
    font-weight: bold;
}

code {
    background-color: #CCC;
    display: block;
    padding: 20px;
}
@media (max-width: 600px) {
  #navbar {
    width: 100%;
    position: relative;
  }

  #main-doc {
    margin-left: 0;
  }