<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<section id="colors-intensity">
<h2 class="section-heading">
Colors and intensity
</h2>
<p class="mb-4">Use one of the classes below to change the color and intensity of the overlay.</p>
<section>
<br>
<h4>Strong overlay</h4>
<br>
<div class="row">
<div class="col-md-2">
<div class="view overlay">
<img src="https://mdbootstrap.com/img/Photos/Horizontal/Nature/4-col/img%20(31).jpg" class="img-fluid" alt="Image with a strong blue overlay.">
<div class="mask rgba-blue-strong"></div>
</div>
<p class="text-center"><code>.rgba-blue-strong</code></p>
</div>
<div class="col-md-2">
<div class="view overlay">
<img src="https://mdbootstrap.com/img/Photos/Horizontal/Nature/4-col/img%20(31).jpg" class="img-fluid" alt="Image with a strong red overlay.">
<div class="mask rgba-red-strong"></div>
</div>
