JSFiddle - React, Tailwind, and code Playground

HTML

<div class="myImage"></div>

SCSS

.myImage {
    height: 10em;
    width: 20em;
    background-image: url(http://lorempixel.com/g/400/200/);
    margin: 1em auto;
    background-size: 100% 100%;
    @media (min-width: 50.000em) {
        height: 20em;
        width: 40em;
        background-image: url(http://lorempixel.com/g/800/400/);
    }        
}