JSFiddle - React, Tailwind, and code Playground

HTML

<iframe class="browser1"></iframe>
<button>Load</button>

CSS

iframe {
    width: 320px;
    height: 480px;
}

JavaScript

function mobile320() {
    document.querySelector(".browser1").setAttribute("src", "http://www.idevtechnolabs.com");
}

document.getElementsByTagName("button")[0].onclick = mobile320;