SOURCE

<header>
  <h2>Header Section</h2>
</header>

<main>
  <h2>Main Section</h2>
</main>

<nav>
  <h2>Nav Section</h2>
</nav>

<aside>
  <h2>Aside Section</h2>
</aside>

<footer>
  <h2>Footer Section</h2>
</footer>

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

body {
  width: 100vw;
  min-height: 100vh;
  margin: 0;
  background-color: #291642;
  font-family: "Gochi Hand", sans-serif;
  font-size: 100%;
  letter-spacing: 0.1rem;
  color: #fff;

  display: grid;
  grid-template: auto 1fr auto / 220px 1fr 220px;
}

header {
  background-color: #2196f3;
  min-height: 15vh;
  grid-column: 1 / 4;
}

main {
  background-color: #795548;
  color: #fff;
  grid-column: 2 / 3;
  grid-row: 2 / 3;
  margin: 0 2vh;
}

footer {
  min-height: 20vh;
  background-color: #222;
  grid-column: 1 / 4;
}

nav {
  background-color: #ff9800;
  color: #fff;
  grid-column: 1 / 2;
  grid-row: 2 / 3;
}

aside {
  background-color: #607d8b;
  color: #fff;
  grid-column: 3 / 4;
  grid-row: 2 / 3;
}

h2 {
  text-align: center;
  margin: 2vh 0;
}

View Compiled