Antimatter - showcase overlapping menu

Hi,

I'm going to change the text logo to a image logo. However, it looks terrible when the showcase module overlaps the menu with it's background image.

Is there a way to remove it so above the showcase it's just a white block?

Thanks

I wasn't sure if i made my self clear. I've uploaded a picture of where i want it to be pure white instead of having the showcase section behind it?

Thanks!