change calendar color


how can i apply/change the orange in the calendar for the “BuddyPress Group Calendar” plugin ?

I managed to use “inspect element” in Safari to see the change live, but what would be the exact CSS code to apply in my theme ?

i am currently using Kleo theme locally on MampPro.

the theme has the option to apply custom CSS.

(the screenshots shows the plugin and inspect element – i changed text using Ultimate Branding)

any kind assistance would be greatly appreciated,