JSFiddle - React, Tailwind, and code Playground

HTML

<div id="outer">
<div id="container">
    <div id="element">
        some text
    </div>
</div>
</div>

CSS

#container {
    display: inline-block;
    position: relative;
    width: 50%;
}
#container:after {
    content: '';
    display: block;
    margin-top: 100%;
}
#element {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: silver;
}

div {
    margin: 0;
    padding: 0;
}

#outer {
    background-color: blue;
}

JavaScript

console.log($('#outer').height())
console.log($('#container').height())