Audio player formatting problem

Hi, I’m trying to find where in the CSS I can adjust how the audio player (using the [audio] tag) displays. When I post an audio link for playback, the formatting of the audio player looks “off”. The control buttons look fine (Play, Pause & Volume) but the font that displays the time is cropped at the bottom. You can see an example at theretroguy.com/category/the-wild-swans/

I’ve tried different themes and I’m not experiencing this issue, so I’m guessing it’s an issue with the Hostmarks theme itself. Any ideas please? Thanks in advance!