Hi,
Thanks for using our plugins.
I am limited in support custom css modifications, but can try to help out.
For the single event I can provide this:
.single.single-tribe_events .tribe-events-event-meta {
background: #000;
border: none;
}
Add that css to your theme’s stylesheet or through a plugin such as Simple Custom CSS.
For the month view it is much more in depth to change the background color and I cannot provide all that css.
We have these two articles about how to make further changes that might help your out:
https://theeventscalendar.com/knowledgebase/changing-fonts-and-colours/
Using Google Chrome Developer Tools
Cheers!