How to get Parallax background?

So here is the code to a simple background parallax that i would like on my website.

$(window).scroll(function (e) {
parallax();
});

function parallax() {
var scrolled = $(window).scrollTop();
$(‘.pizza-hero’).css(‘top’, -(scrolled * 0.2) + ‘px’);
}

Where would i put this, in the header box of the custom code or the body box of the custom code? Here is the code pen of it working Here

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the body box custom code =)