stickyNavigation.js

$window = $(window);

$window.on('scroll', _stickyNav);

function _stickyNav() {
	y = $(this).scrollTop();

	if ( y >= 5 ) {
		$header.addClass('header-scroll');
	} else {
		$header.removeClass('header-scroll');
	}
}

.header-scroll {
	background: rgba(37, 37, 37, .98);
	padding: 8px 1%;
	transition: padding .2s;
}