Change the color of the hover line

Hello everybody,
just got one little question:

I succeeded to change the color of the hover line in the main menu from black to my customized color (red) using the css from your documentation:

/* Underline color on hover */
#top #avia-menu .menu-item:hover > a > .avia-menu-fx {
background-color: #8c084c;
border: none !important;
}

BUT, the line under Start is still black. I would like to get the black line under “Start” red as well. How can I manage that?
I added a screenshot in Imgur as well as the link to my website. Pls see private content.

Thanks for advising me.
Anne