<main class="canvas-container">
  <h1>This sorta looks like a standard document already, right?</h1>
  <p>Start adding content wherever.</p>
  <div class="multicolumn">
    <p>We can use layout tools like Flexbox or Grid...</p>
    <p>to help us achieve custom layouts, like multiple columns.</p>
  </div>
</main>

body {
  background: lightgray;
}

.canvas-container {
    margin: 0 auto; /* for centering, feel free to use flexbox or some other method*/
  box-sizing: border-box;
  padding: 0.5in; /* controls margins */
  width: 8.5in;
  height: 11in;
  background-color: white;
  box-shadow: 0 3px 8px -3px rgba(0, 0, 0, 0.7);
}

.multicolumn {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}