Now normal scrolling is a nice way to go, but if you want to use horizontal scrolling, what you going to use? Stellar.js is a jQuery plugin that provides this functionality (parallax scrolling effect) to any scrolling element.
There are a lot of options provided like speed (scrolling speed), ratio or other configurable options. There is a documentation page that provides example how to use parallax scrolling plugin. The awesome thing about this parallax scrolling plugin is that it supports iOS nicely and there is a documentation for that also!
Awesome parallax scrolling with Stellar.js