I am wondering if anyone has found a way to override the CSS contained in the page referenced by an iframe application. I have a working iframe application and it displays the canvass URL. However the canvass URL is an external page over which I have no control. (it is a booking system to which I subscribe and of which I have legitimate use but no ability to amend css) The external page references a CSS file that sets the page width at 1000px but I want to override this and set the page width to the Facebook standard of 520px. Anyone managed to do that?