1.12 - Overlay
Source: atoms/_overlay.scss, line 24
.overlay add a black tint transparent color to the background image, it needs a .overlay-content children
Example:
<section class="bg-cover overlay" style="background-image: url(https://source.unsplash.com/random)">
<div class="overlay-content has-text-center">
<h1>Overlay</h1>
</div>
</section>
<!--No overlay-->
<section class="bg-cover" style="background-image: url(https://source.unsplash.com/random)">
<div class="overlay-content has-text-center">
<h1>No Overlay</h1>
</div>
</section>