White line below top menu – remove?

Hello. New to the theme, just switched to it from a previous theme that I was using for a long time. For my header images, I am using a Metaslider photo slider. I am using Beaver Builder. I have the page headers removed with CSS code:

/*
Removes header images and container for pages
*/
.entry-header {
display: none; }

So the slider is supposed to butt up right under my menu. But you can see there’s a thin white line between the black menu and the top of the sliding images below. There must be some kind of container there. Is there a way to make it black, or a way to remove that space?

The page I need help with: [log in to see the link]