Black Highlight Issue - Message Input Section

I’ve embedded the Voiceflow chat widget on a site I built using bolt.new — everything works smoothly, except for one thing:

The input field where users type messages has a black background, and I can’t change it to match my site’s theme.

I’ve tried:
- CSS overrides (.vfrc-chat-input)
- JS injection after load
- Using !important on all properties

But nothing seems to apply, I suspect the input might be inside a protected iframe or Shadow DOM?

Is there a way to style the input field via config or widget theming?
Would love to align it with the rest of the site.

Thanks in advance!