JSFiddle - React, Tailwind, and code Playground

HTML

<div class = "box">
    <div class = "content">Ratio 1:2</div>
</div>

CSS

html, body {
 height: 100%;
 width: 100%;    
}

/* Box styles */
.box {
 width: 100%;
 position: relative;
 display: inline-block;
 max-width:200px; /* max width of the box */
}

.box:after {
    padding-top: 50%; /*1:2 ratio*/
    display: block;
    content: '';
}

/* Style that should be applied to the box content */
.content {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background-color: green;
}