Parallax with One Line of CSS
Parallax scrolling has been a popular effect on the web for decades now. It's generally accomplished using JavaScript to control multiple layers of elements on your page, moving them at differing rates while you scroll.
But what if we could accomplish this with JUST CSS? Well, that's what the background-attachment: fixed; property is for!
It's not particularly flexible, but if you're looking to add that traditional fixed background effect to your site, this is by far the easiest way to do it!