JSFiddle - React, Tailwind, and code Playground

HTML

<div id="box">Text will be here</div>

CSS

body, html {
    width: 100%;
    height: 100%;
    margin: 0;
}
#box {
    width: 100%;
    height: 100%;
    border: 5px solid red;
    padding: 15px;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}