JSFiddle - React, Tailwind, and code Playground

HTML

<img src="http://www.canim.net/araba/images/Acura_Adcd-SportsCar_77_1024x768.jpg"/>
<p>SOME TEXT GOES HERE</p>

CSS

body, html{
    margin:0;
    padding:0;
}
img{
    margin:0;
    padding:0;
    position:absolute;
    z-index:0;
}
p{
    position:absolute;
    z-index:1;
    color:white;
    font-size:30px;
    font-weight:bold;
    margin:10px;
}

JavaScript

$(window).resize(function(){
    var bgwidth = $(window).width(),
    bgheight= $(window).height();
    $('img').attr({width:bgwidth, height:bgheight});
})