<p>The <em>Pythagorean theorem</em> is often expressed as the following equation:</p>

<p>
  <var>a<sup>2</sup></var> + <var>b<sup>2</sup></var> = <var>c<sup>2</sup></var>
</p>

p {
  font:
    1rem 'Fira Sans',
    sans-serif;
}