If you are trying to keeps things good as browser windows or screens change size, look to a responsive theme which should do all of the work for you.
As for your question, there isn't an HTML version of your page. That is created dynamically when the page is loaded. If you put the code in an HTML module, you might be able to get at it from the Page Personal Bar item. The Advanced tab includes a list of modules added to the page, and links (pencil icon) to edit them.