💄 Add backgroundColor theme field for Popup

And use it for the onboarding modal

Closes #375

apps/builder/src/features/dashboard/components/OnboardingModal.tsx

@@ -16,6 +16,7 @@ export const OnboardingModal = ({ totalTypebots }: Props) => {
     '/bots/onboarding.json',
     '/bots/onboarding-dark.json'
   )
+  const backgroundColor = useColorModeValue('white', '#171923')
   const { user, updateUser } = useUser()
   const [typebot, setTypebot] = useState<Typebot>()
   const confettiCanvaContainer = useRef<HTMLCanvasElement | null>(null)
@@ -102,6 +103,9 @@ export const OnboardingModal = ({ totalTypebots }: Props) => {
           prefilledVariables={{
             Name: user?.name?.split(' ')[0] ?? undefined,
           }}
+          theme={{
+            backgroundColor,
+          }}
           defaultOpen={isNewUser}
           onAnswer={handleNewAnswer}
           onEnd={handleBotEnd}