script console.log("footer script running"); (function($) { $(window).scroll(function() { console.log("scrolling..."); var scroll = $(window).scrollTop(); $(".zoom").css({ backgroundSize: (100 + scroll/50) + "%", top: -(scroll/50) + "%", //Blur suggestion from @janwagner: https://codepen.io/janwagner/ in comments "-webkit-filter": "blur(" + (scroll/200) + "px)", filter: "blur(" + (scroll/200) + "px)" }); }); })( jQuery ); script