No background color settings?

hi,
installed Events Manager; also using Astra Pro and Elementor Pro;
the calendar appears on the page but due to the background image in astra the text of the events is not readable; problem would be solved if i could give the calendar a background color; how could i do this?
not in settings of Events Manager;

help is much appreciated

password for the url is nesfuture

The page I need help with: [log in to see the link]