JSFiddle - React, Tailwind, and code Playground

HTML

<div id="header" class="style2">
    <div id="header2" class="style2">Public Vision</div>
</div>
<input id="showHideContainer" type="image" src="http://i.imgur.com/5LGqY2p.jpg?1" height="100" width="100" alt="On" ;>

CSS

body {
    background-color:grey;
    z-index:3;
}
body.style2 {
    background-color:white;
    z-index:3;
}

JavaScript

document.getElementById('showHideContainer').onclick = function () {
    divTest = document.getElementById('header');
    if (divTest.style.display === "none") {
        divTest.style.display = 'block';
    } else {
        divTest.style.display = "none";
    }
    $('body').toggleClass('style2');
};