URGENT: Styling and embedding d-id agent in app

Dearest D-id Team.
I prepared and Agent, but I need to integrate it in a html page where:

Agent is full screen vertically
Agent starts by replying to a prompt injected in the html.
Despite multiple implementation attempts and CSS adjustments, the agent consistently appears in the bottom-right corner of the viewport instead of being centered as intended.
can you please point me towards the right way to achieve proper implementation and styling of the agent via CSS ?
Thank you!