JSFiddle - React, Tailwind, and code Playground

HTML

<div style="resize:both;">Foo</div>
<div style="resize:vertical;">Bar</div>
<div style="resize:horizontal;">Baz</div>
<textarea style="resize:none;">Qux</textarea><br/>
<textarea></textarea>

CSS

div {
    overflow:auto; /*You need to set overflow to something other than visible*/
    width:100px;
    height:100px;
    background:#F55;
    margin:5px;
}