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.
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