<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<link href="//maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css" rel="stylesheet">
<div class="slider">
<div class="slider-control slide-left"><i class="fa fa-minus fa-2x"></i></div>
<div class="slider-control slide-right"><i class="fa fa-plus fa-2x"></i></div>
<div class="slide-box">
<div class="slide" style="background-image: url(https://images.unsplash.com/photo-1427435150519-42d9bcd0aa81?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&s=1896a40b338ccfb0d8ff7e5199e5ecd2)">
<div class="slide-content">
<H1>A Full Page Slider</H1>
<p>With a flex-box container inside it.</p>
</div>
</div>
<div class="slide" style="background-image: url(https://images.unsplash.com/photo-1452800185063-6db5e12b8e2e?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&s=2700f9770386e4c5ebc53502a9099966)">
</div>
<div class="slide" style="background-image: url(https://images.unsplash.com/photo-1452274381522-521513015433?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&s=476b9724fcf47b51c652d66e384f9ba0)">
</div>
</div>
</div>
<script>
var $slider = $('.slider');
var $slideBox = $slider.find('.slide-box');
var $leftControl = $slider.find('.slide-left');
var $rightControl = $slider.find('.slide-right');
var $slides = $slider.find('.slide');
var numItems = $slider.find('.slide').length;
var position = 0;
var windowWidth = $(window).width();
$slides.width(windowWidth);
$leftControl.on('click', function(){