drop down menu in arclite

Have you checked this in style.css
ul#nav li a {
color:#B5D1E6;
font-size:115%;
font-weight:bold;
text-decoration:none;
text-shadow:1px 1px 1px rgba(0, 0, 0, 0.3);
}

and change 115% to less

thankyou
can i change this in the custom css spot – or do i need to edit the main files. (I try not to do that)
and to be clear – i dont want to change the main nav bar – just the drop down list – if you look at the qualifications one it’s huge.

i made a qualifications index but the third level (child?) is the one thats too large

changing that will change the whole menu.