JSFiddle - React, Tailwind, and code Playground

HTML

<div id=msg>

 <div id=content>
     aaaaaaaannnnnnnnnn<br>
     aaaaaaaannnnnnnnnn<br>
     aaaaaaaannnnnnnnnn<br>
 </div>
 
 <div id=text>
  <textarea></textarea>
 </div>

</div>

CSS

#msg{
 width:60%;
 height:500px;
 float:left;
 background-color:#fff;
 border:1px solid #000;
 overflow-y: auto;
}
#text{
 bottom:0;
}