JSFiddle - React, Tailwind, and code Playground

HTML

<div id="test">
    <div id="test2">
        this is<br/>
        just some<br/>
        test text<br/>
        to test<br/>
        the height<br/>
         of each <br/>
        div<br/>
    </div>
</div>

CSS

#test {
    border: 1px solid red;
    overflow: hidden;
}
#test2 {
    height: auto;
    width: 200px;
    float: right;
    border: 1px solid blue;
}