The exact location of the CSS code for this style in the Theme.scss file may vary depending on which theme you are using, but the CSS selector should look something like this:

nav li .sub a

In other words, you will need to look for the styles in that stylesheet that are being applied to links (<a> tags) within elements that have the class "sub" that are within <li> elements (list items) that are inside the <nav> element.

If you come across this question and cannot find this in your Theme.scss file, feel free to email [email protected] and we can help you find the correct place in the code to make the change.