Hi gtjeerdsma
I added a custom module with id 111 and loaded it via megamenu from your backend
You can change width as you wish from module iframe code
gtjeerdsma without changing a css file in the t3-assets/css directory every time i change something?
You should not use the t3-assets folder because it is used to store optimized files when you enable css optimization from template manager General tab - You should indeed use a custom.css file to add all your customizations
Hope it helps