Remove Header Banner

I’m trying to remove/hide the header banner but still show the logo in the same location to the left of the menu. I can’t get rid of that extra ribbon of color. I’m guessing that header banner is what’s causing the menu color to be darker than it is supposed to be (it’s supposed to be the color of the banner I’m trying to get rid of). I’m also trying to keep the menu from turning white when scrolling.

Any help would be greatly appreciated. Thank you in advance.

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