submenu link color

Apologies for sending you this many questions. I've really tried figuring things out, but there's just a few things where my knowledge of WordPress and your themese are insufficient. I have been adding additional pages so that we can start putting in the content and have expanded on the header menu with some submenus. However I can't seem to find where to set the main color for the submenu links. It would be fine if the colors were the same as the primary menu items, but they seem to be some very dark grey. The hover is working as expected. I've made another screenshot to illustrate: http://sportplatformwaddinxveen.nl/wp-content/uploads/2021/01/Screenshot-2021-01-18-214158.png http://sportplatformwaddinxveen.nl/ , shows you the menu live. Kind regards, David van Balgooi