Stand alone Booking/Inquiry widget form appearance

Is there any way to add a little flair (like a background image ) to a standalone booking/inquiry widget , When you click a link https://secure.ownerrez.com/widgets/e399cb8eee834729ac9a35de4cfb89dc?view=form&propertyKey=0a4808a7e8e943e489771b0d3076751a the form opens bu looks very generic. Is there a place to customize the header so that it applies only to a standalone (not embedded) form? Thanks

If you configure a form header/footer in Settings > Theming, that will be applied to the standalone form as well as to quote and booking forms.