Header Right Sidebar Widget Change Color

Hi I just added my header image logo. I wanted to add an ad on the header right side bar however when it's added there's a white color still and doesn't look well with the shade of blue I have for my logo. I was wondering if I could place an ad on the side of my logo instead of the right sidebar or if that's not possible how can I change the color surrounding the ad widget so it won't be white? *Also just a request for future updates. You should definitely consider allowing us to place Ads below the primary menu. My website www.NintendoLinked.com