<div class="height">
  <h2>Make a <code>&lt;div&gt;</code> 100% Height of Browser Window (Old Technique)</h2>
  
  <p>The element with the blue backround stretches to fill its parent no matter the size of the window. The key to this is ensuring there is 100% height on the body and html elements, as well as the child element.</p>

</div>

* {
  box-sizing: border-box;  
}

html, body {
  height: 100%;
}

body {
  font-family: Arial, sans-serif;
  font-size: 20px;
}

.height {
  text-align: center;
  margin: 0 auto;
  max-width: 600px;
  background: lightblue;
  min-height: 100%;
  padding: 0 20px;
}

h2 {
  padding-top: 20px;
  margin: 0;
}

p {
  text-align: left;
  padding: 0 20px;
}

code {
  color: firebrick;
}