HTML

<div class="parent">
    <header class="section coral">Header</header>
    <div class="left-side section blue">Left Sidebar</div>
    <main class="section green"> Main Content</main>
    <div class="right-side section yellow">Right Sidebar</div>
    <footer class="section coral">Footer</footer>
  </div>

CSS

        .parent {
  display: grid;
  grid-template: auto 1fr auto / auto 1fr auto;
}

header {
  padding: 2rem;
  grid-column: 1 / 4;
}

.left-side {
  grid-column: 1 / 2;
}

main {
  grid-column: 2 / 3;
}

.right-side {
  grid-column: 3 / 4;
}

footer {
  grid-column: 1 / 4;
}