<h1 class="subtitle is-1">Subtitle 1</h1>
<h2 class="subtitle is-2">Subtitle 2</h2>
<h3 class="subtitle is-3">Subtitle 3</h3>
<h4 class="subtitle is-4">Subtitle 4</h4>
<h5 class="subtitle is-5">Subtitle 5</h5>
<h6 class="subtitle is-6">Subtitle 6</h6>
