JSFiddle - React, Tailwind, and code Playground

HTML

<div class="fullscreen">
            <iframe id="data"></iframe>
 </div>

CSS

#data{
    width: 100%;
    height: 400px;
}

JavaScript

var div = document.getElementById('data');
        var data = new Date();

        var d = new Date();
        var mes = d.getMonth()+1;
        var dia = d.getDate();

        /// alterando o style
        var imagem =         'https://marcelogibson.com/stackoverflow/01.svg';
        div.style.backgroundImage='url('+imagem+')';