Transparent background on page include

I’ve build a page that I’m using as a page include to match our component drive framework. That page needs a transparent background so whatever page it’s being included in will drive the background color. However, when I load the page I’m noticing the element the ‘nx-page’ class is assigning a background color of white. I don’t see this configurable anywhere in spark. Is there any way to suppress that or change it to transparent so the page include I’m using can leverage the background of the hosting page?

I do this in Millau. Just set the background of the page being included to transparent in the styles tab of the page properties. By default they are background = white.