JSFiddle - React, Tailwind, and code Playground
HTML
<div id='container' style='width:600px; border:1px solid black;'>
<textarea style='border-style:none none dashed none; border-color:black; width:100%; display:block;box-sizing:border-box;border-width:1px; margin-bottom:1px;'></textarea>
<div style='width:100%; box-sizing:border-box; height:35px;padding:5px;'>
<button style='float:right'>Lama mama
</button>
</div>
</div>