I would probably just serve the CSS using a servlet that fetches the CSS 
from database based on the current customer. The app would then have a 
small UI to update the CSS in the database.

If you don't need to give customers full control but just want to allow 
them to change logo / colors then I think you can also use CssResource 
runtime evaluation. That is you would define

@def APP_BACKGROUND_COLOR 
eval("com.example.app.client.resource.Branding.getBackgroundColor()");

and then use APP_BACKGROUND_COLOR throughout your CssResource styles. To 
make Branding.getBackgroundColor() return the correct value for a given 
customer you would load that information from your server and set it on the 
Branding class before you inject the CSS. In your app UI you would then 
have a simple text box where customer can change the CSS hex color.

-- J.

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