featuresOffset = $features.offset().top
	featuresHeight = $features.innerHeight()
	featuresCenter = featuresOffset + featuresHeight / 2

	windowHeight = $window.height()

	$document.on 'scroll', ->
		scrollTop = $document.scrollTop() + windowHeight / 2
		if scrollTop > featuresCenter
			$features.css 'background-attachment', 'scroll'
		else
			$features.css 'background-attachment', ''
	.trigger 'scroll'



.scroll-logo {
	background: url(images/o-colored.png) 50% 50% no-repeat fixed;
	background-size: 30%;
}