JSFiddle - React, Tailwind, and code Playground
HTML
<div id="inside">
<div id="dinamic">блок с динамической шириной </div>
</div>CSS
body { overflow-x:hidden;}
#inside { width:2000px; position:absolute; left:50%; margin-left:-1000px; text-align:center; overflow:hidden; }
#dinamic {background: blue; display: inline-block; }