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http://www.w3schools.com/howto/howto_css_parallax.asp


.parallax { 
    /* The image used */
    background-image: url("img_parallax.jpg");

    /* Set a specific height */
    height: 500px; 

    /* Create the parallax scrolling effect */
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}