Event details hidden under menu bar

When you hover over an event date, the details section get put under my menu bar but over my header, so it looks like the bar is just floating over the information. It blocks viewing the calendar info and looks really weird.

Not going to change the menu location, but how do I fix this problem?

Here’s my site: https://idahocsn.org/calendar/

https://www.ads-software.com/plugins/google-calendar-events/