JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

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