<main>
  <header>
    <h1 class="title">My great page</h1>
  </header>
  <p>Lorem ipsum dolor, sit amet consectetur adipisicing elit. Voluptatibus, delectus blanditiis esse quasi in vitae repellat animi similique fugit pariatur expedita ducimus qui. Totam harum accusantium tempore, soluta officiis suscipit?</p>
  <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Non quia veritatis consequuntur atque cumque modi repellat ullam itaque vero ducimus? Unde labore error quos dolorem odio vel non voluptate molestiae?</p>
  <p>Ad explicabo sint facilis soluta voluptatem aperiam laudantium iusto inventore nihil assumenda amet est in blanditiis temporibus, sequi optio, esse neque architecto ipsum maxime ducimus tenetur necessitatibus. Autem, quos ullam.</p>

</main>
body {
  margin: 0;
  font-family: sans-serif;
  background-color: yellow;
}

main {
  background-color: darkgreen;
  color: white;
  margin: 0 auto;
  padding: 2rem;
  width: 60vw; /*this will be 60% of the width of the viewport */
  height: 100vh; /* this will be the full height of the viewport but will not stay when scrolled */
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.