<h2 class="toc">Text opacity</h2>

{% apply view_source %}
<div class="row">
  <div class="col opacity-10">10% opacity</div>
  <div class="col opacity-20">20% opacity</div>
  <div class="col opacity-30">30% opacity</div>
  <div class="col opacity-40">40% opacity</div>
  <div class="col opacity-50">50% opacity</div>
  <div class="col opacity-60">60% opacity</div>
  <div class="col opacity-70">70% opacity</div>
  <div class="col opacity-80">80% opacity</div>
  <div class="col opacity-90">90% opacity</div>
</div>
{% end %}

<code class="highlighter-rouge">.opacity-10</code> sets opacity to <code>10%</code>. Other classes have similar behavior.
