Example
I am a H1 tag
I am a H2 tag
I am a H3 tag
I am a H4 tag
Markup: base\headlines.twig
<h1>I am a H1 tag</h1>
<h2>I am a H2 tag</h2>
<h3>I am a H3 tag</h3>
<h4>I am a H4 tag</h4>
Source:
base/_base.scss
, line 16