JSFiddle - React, Tailwind, and code Playground

HTML

<div>
<div id="rightdiv" >right content right content right content</div>
<div id="leftdiv">left content left content left content</div>
</div>

CSS

#leftdiv {
    background: yellow;
    min-width: 400px;
    max-width: 800px;
}

#rightdiv {
    background: red;
    width: 50px;
    float: right;
}