JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container one">
    <img src="http://placehold.it/250x250" />
</div>

<br /> <br />

<div class="container two">
    <div class="foo">bar</div>
</div>

CSS

.container.one {
    background-color: red;
    height: auto;
}

.container.two {
    background-color: blue;
    height: auto;
}

.foo {
    width: 250px;
    height: 250px;
    background-color:gray;
}