JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
    <head></head>
    <body>
        <div>
            <textarea></textarea>
        </div>
    </body>
</html>

CSS

div {
    border: 1px solid red;
    width: 100px;
    height: 15px;
}
textarea {
    width: 100%;
    height: 100%;
    border: 1px solid blue;
    resize: none;
    
    box-sizing: border-box;
    -moz-box-sizing: border-box;
    -webkit-box-sizing: border-box;
}