JSFiddle - React, Tailwind, and code Playground

HTML

<div class="example">
    
    <div class="gray">
        test text
        test text
    </div>
</div>

CSS

.example{
    height: 200px;
    background-image: url("http://images.visitcanberra.com.au/images/canberra_hero_image.jpg"); 
    color: white;
    
}

.gray{
    height: 200px;    
    background-color: black;
    opacity: 0.5;
    color: white;
}