Hi everybody!
I can see that some comics have a color background and that some others even have custom buttons that make the page looks very cool, but I can't find the correct way to do that and I can't find either a tutorial about how to do that… Any help will be thankfully apreciated! (sorry the bad english!)

There's some advice on buttons on our help site here: https://sites.google.com/site/theduckhelp/comic-webpages/changing-your-navigation-buttons

To get colours and change things you just activate the layout mode on your comic page: