I am a programmer from a company that supplies web content to sites via an iFrame. Shopify is altering the supplied CSS/HTML and I need help as to how to handle this. The problem is that the client's Shopify template uses a black background. When Shopify changes the background of the iFrame to black and then uses black text color, the text becomes unreadable. Is there a way to stop Shopify from stripping out my HTML?