Formatting Play button for AnkiWeb browser-view

I’m working on an update to a shared deck and hoping that someone might be able to offer advice on formatting the audio play button in the AnkiWeb web-view.
I have it nicely styled for both the desktop and mobile apps, but cannot manage to replicate the effect for the Anki-web browser.

I’d like just a simple play icon (Screenshots below)

AnkiWeb uses the browser’s audio controls, and does not provide a play button like the other clients.