JSFiddle - React, Tailwind, and code Playground

HTML

<div id='container'><div id='sticky'>x</div></div>

CSS

#sticky { 
    width: 100px; 
    height: 100px; 
    background: red; 
    float: right;
}

#container { 
    width: 900px; 
    height: 200px; 
    background: blue; 
}