Change color of bottom line in menu by CSS

Hi…
I’ve changed the color of the main menu of my template – fortuna and fortuna child to orange but still the blue color on menu hover appeared.
So i changed it by CSS and the letters already appear in orange but not the bottom blue line on mouse hover.
Can you tell what would be the correct CSS to change this bottom line?

Already checked the cog icon on visual composer on my pages to see if there is any code there.