JSFiddle - React, Tailwind, and code Playground

HTML

<div id="main">
<div id="left">мало текста</div>
<div id="right">тут<br>много<br>текста<br></div>
</div>

CSS

#main {
    width:600px;
}

#left {
    float:left;
    width:200px;
    height:100%;
    border:1px solid black;
}

#right {
    margin-left:200px;
    width:400px;
    height:100%;
    border:1px solid black;
}