Custom CSS for Wordpress Divi Theme

I use Divi Theme on my Wordpress site. Its mostly how I want it to look but I really like the homepage of the Wix site. Specifically the things I would like done are to emulate the way the main image on the Wix website scrolls up and reveals content undereneath that is underneath a white background, but the more you scroll up the more the content appears. Also the content doesn't start to move until the main header image is scrolled right to the top. Ref: https://www.wix.com My website: http://www.jordanfraserweddings.com