JSFiddle - React, Tailwind, and code Playground

HTML

<body>

	<div id="project_presentation">

        <section id="img1" data-type="background" data-speed="19" style="background: url(http://www.vincentleroux.fr/assets/img/projects/product/jorislaarman1.jpg) 0 no-repeat fixed;
		min-height: 1000px; margin: 0 auto; width: 100%; max-width: 1920px; background-size : cover;">
		</section>

		<section id="img1" data-type="background" data-speed="19" style="background: url(http://www.vincentleroux.fr/assets/img/projects/product/jorislaarman2.jpg) 0 no-repeat fixed;
		min-height: 1000px; margin: 0 auto; width: 100%; max-width: 1920px; box-shadow : 0 0 30px #292929; background-size : cover;">
		</section>

		<section id="img1" data-type="background" data-speed="19" style="background: url(http://www.vincentleroux.fr/assets/img/projects/product/jorislaarman3.jpg) 0 no-repeat fixed;
		min-height: 1000px; margin: 0 auto; width: 100%; max-width: 1920px; box-shadow : 0 0 30px #292929; background-size : cover;">
		</section>

		<section id="img1" data-type="background" data-speed="19" style="background: url(http://www.vincentleroux.fr/assets/img/projects/product/jorislaarman4.jpg) 0 no-repeat fixed;
		min-height: 1000px; margin: 0 auto; width: 100%; max-width: 1920px; box-shadow : 0 0 30px #292929; background-size : cover;">
		</section>

		<section id="img1" data-type="background" data-speed="19" style="background: url(http://www.vincentleroux.fr/assets/img/projects/product/jorislaarman5.jpg) 0 no-repeat fixed;
		min-height: 1000px; margin: 0 auto; width: 100%; max-width: 1920px; box-shadow : 0 0 30px #292929; background-size : cover;">
		</section>

		<section id="img1" data-type="background" data-speed="19" style="background: url(http://www.vincentleroux.fr/assets/img/projects/product/jorislaarman6.jpg) 0 no-repeat fixed;
		min-height: 1000px; margin: 0 auto; width: 100%; max-width: 1920px; box-shadow : 0 0 30px #292929; background-size : cover;">
		</section>

		<section id="img1" data-type="background" data-speed="19"...

CSS

@charset "utf-8";
/* CSS Document */




/* CSS RESET */

/* http://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/

html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
b, u, i, center,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td,
article, aside, canvas, details, embed, 
figure, figcaption, footer, header, hgroup, 
menu, nav, output, ruby, section, summary,
time, mark, audio, video {
	margin: 0;
	padding: 0;
	border: 0;
	font-size: 100%;
	font: inherit;
	vertical-align: baseline;
}

/* HTML5 display-role reset for older browsers */
article, aside, details, figcaption, figure, 
footer, header, hgroup, menu, nav, section {
	display: block;
}
body {
	line-height: 1;
}
ol, ul {
	list-style: none;
}
blockquote, q {
	quotes: none;
}
blockquote:before, blockquote:after,
q:before, q:after {
	content: '';
	content: none;
}
table {
	border-collapse: collapse;
	border-spacing: 0;
}

/* CSS RESET END */


#project_presentation
{
	margin-bottom : 65px;
}

#project_presentation_tc
{
	position : fixed;
	bottom : 0;
	background-color : #f4f3d8;
	width : 100%;
	box-shadow : 0 0 30px #292929;
}

#project_presentation_tc p
{
	width : 1000px;
	margin : auto;
	font-family : 'Dosis', sans-serif;
	font-size : 1.4em;
	text-align : center;
	margin-top : 10px;
	margin-bottom : 10px;
}

JavaScript

$(document).ready(function(){

	var $window = $(window); 

	$('section[data-type="background"]').each(function(){
	var $bgobj = $(this); // assigning the object
		
		$(window).scroll(function() {
		var yPos = -($window.scrollTop() / $bgobj.data('speed'));
			// Put together our final background position
			var coords = '50% '+ yPos + 'px';
			// Move the background
			$bgobj.css({ backgroundPosition: coords });
		});
	});
});