See paralax in action

Basic structure

        <section class="parallax" id="id-example">
            <div class="container text-center">
                Content 
            </div>
        </section>

Changing background

Set ID for the section of your parallax and add image url.

        <section class="parallax" id="id-example">
            <div class="container text-center">
            
            </div>
        </section>
        
        
        #id-example {
            background-image: url(http://brandflow.pl/wp-content/uploads/2015/09/slider3.jpg);
        }