JSFiddle - React, Tailwind, and code Playground

HTML

<iframe></iframe>
<iframe src="mobile.css"></iframe>
<iframe src="./"></iframe>
<iframe></iframe>

CSS

html, body {
    margin: 0px;
    padding: 0px;
    border: 0px;
    width: 100%;
    height: 100%;
}
iframe {
    width: 50%;
    height: 50%;
    margin: 0px;
    padding: 0px;
    background: blue;
    border: 0px;
    display: block;
}