Change secondary menu font weight

Dear Support Team,

I would like to change the font and font weight of the secondary menu. Secondary menu = right on top of the header, where you can put extra information like phone number.

I found this code and pasted it into the quick CSS:
Thread: https://kriesi.at/support/topic/secondary-menu-anpassen/

.sub_menu>ul>li>a, .sub_menu>div>ul>li>a {
font-weight: normal;
}

Unfortunately it does not work. I tried it also with “bold”, “thin” and numbers to see if anything happens. No chance.

Can you help me with a new short code?

To let you know, I already use this code to define the header font. Perhaps there is an inference between the two short codes?

.header_color .main_menu ul:first-child > li > a { color: #888888; font-weight: 500; font-family: Verdana; }
.header_color .main_menu ul:first-child > li > a:hover { color: #888888; }
.header_color .main_menu ul:first-child > li.current_page_item > a { color: #888888; }

Thank you very much!
Sandra