I did before, marked ‘firefox issue’. Your code (getting rid of the margin-top custom css) fixes the Firefox issue of the whole page being pushed to the side, I just don’t understand how a margin-top line of code would affect how the page behaves horizontally.
So, as you can see in the ‘proper website’ picture (how it looks in IE and Chrome) the slider needs to go under the header (which is why I added the margin-top css). So I was just asking if there was a different way I should be doing this that fits better within Dante.