Hi, I'm using bïfrost as my base theme, but adjusting some parts. I'd like to remove the underline that appears on my portfolio items name while hovering. 

Also, I used the elementor menu instead of bifrosts menu, but now, in mobile mode, the hamburger turns grey with a black background when hovering, I'm guessing this is because of some css in bifrost theme? Can I remove this somehow?

I have already used this custom css in appearance-customize-additional css:
a:not(button):hover, a:not(button).active {
    box-shadow: none !important;
}
It removes some underlines, but not on the portolio widget. 

Hi,
That doesn't seem to work. 
I have underline on title, and also on active filter, but I can't remove them in normal settings. 

check: www.kopieerik.nl

Any idea on the black background on hover and active hamburger in mobile mode?

I've attached a screenshot of what is the culprit of the black background on the toggle menu. 

#update: I fixed it with custom css:
.e-n-menu-toggle:hover {background-color: transparent !important; }

Still need help with the portfolio name underline on hover