Diva look introduces a new D2W key: stylesheet.
The CSS file computed by this key will can be set used as the global stylesheet for the application in your D2W PageWrapper.
session.theme = 'Simple'
The CSS file _Neutral.css imports a global CSS for the theme, _Neutral.css, a generic one for the edit page ERDIVEditPage.css and CSS files for D2W components used on an edit page.
IE has a limitation of a max. of 32 CSS files imports per page (and at a depth of 3).
2. Image Replacement