different background on each page

Ho Do I have a different background for each page? On some pages, i do not want an image, only a solid colour.
Thanks

Yes, you can use the page class suffix feature in template.

For example, the 'Meet Dee' menu item on your site has id: 110

You go to Templates > GK Folio > Features tab > Suffixes for pages and add a new class newbg to this menu item id: 110:

Now, add custom css rule for above new class:

.newbg #gkBg {
    background: #a653f3;
}

change to your desired background color.