JSFiddle - React, Tailwind, and code Playground

HTML

We are the same width:<br>
<textarea class="textarea"></textarea><br>
<input class="textbox" type="text">

CSS

.textarea, .textbox {
    width: 200px;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box; 
}