I uploaded 2 1200px *300px images to play with the slider and even after I set the padding in the customize>HeaderImage>Showcase background Padding to 0px 0px 0px 0px I still have padding.
Is this a file size issue?
What would you recommend?
here is the link to the temp site http://2013.4dental.com/
This theme has two header groups, one is the Showcase one and the other is the Banner one. Both have different styling, so if you want a full width view of your images (slider), I recommend loading the widget (slider) into the “Banner” widget position and not the showcase one. That should solve your issue you are experiencing.