JSFiddle - React, Tailwind, and code Playground

HTML

<div>
  <span>Hello<br/>World</span>
  <textarea></textarea>
</div>

CSS

div
{
    display: flex;
    flex-direction: column;
    height: 300px;
    width: 400px;
    border: 1px solid red;    
}
span
{
    display: block;
    background-color: red;
}
textarea
{    
    background-color: blue;
    height: 100%;
    width: 100%;
    flex-grow: 1;
}
}