<article>First</article>
<article>Second</article>
<article>Third</article>
<article>Fourth</article>
html {
  font-family: Arial, Helvetica, sans-serif;
  font-size: calc(16px + 1vw);
}

body {
  margin: 0;
  display: flex;
  flex-flow: row wrap;
  width: 100vw;
}

article {
  flex-basis: 50vw;
  box-sizing: border-box;
  height: 50vh;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid black;
  text-transform: uppercase;
  font-size: calc(1.25rem + 1vw);
}

article:nth-child(1) {
  background: Yellow;
}

article:nth-child(2) {
  background: green;
}

article:nth-child(3) {
  background: red;
  color: white;
}

article:nth-child(4) {
  background: blue;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.