For this theme, and most themes as far as I know, I add the background color to the <body> tag, or @body style property. If you are adding it to the <html> or @html, the background color will show on top and thus you won't see what you've added. Just remove the background on @body and you should be good.Im trying to change the background image. I put the image in the html part of the style properties, click save, refresh and the background isnt there. I even checked inspect element, and it shows that the background is in the css.