Constant background color changing

ok… I’m not exactly sure how to explain what I want to do… so I included a link to a site for reference… (the background color effect)

I’m trying to accomplish whats going on in the background… the colors are changing constantly and very smoothly using AS I’m sure… I want the same effect but I want to use specific colors… Theres 5 main colors for the company the site is for…

Can anyone help? thanks! :crazy:

it looks like maybe a simple tween with masking could have been used