How to Remove or Change Background Color on Tablet

Site URL: https://www.musedinteriors.com/

Hi all, 

I just launched a new portfolio website for my client, Mused Interiors, and they're really happy with it! One thing they commented on, is that on certain screen sizes (which I think is tablet), there's this weird tan bar that appears between the project accordion and the footer. 

I don't see it when editing the website (Design > Site Styles) and the Background Tab of the current color selection is already Black. Does anyone know how to edit this to either remove the tan bar that appears on tablet screens or make it black?  

Thanks,
Jairus

I Had similar problem on some sites and used this CSS to fix problem.

body {
    background-color: black;
}

Which page do you have problem?