Ah, Rendo optimizations, say no more. I noticed the banner overlapping when I shrunk the window too.

I tested it on Chrome and IE11 and it's the same when the browser is using all 1440px I've got available. Who can change the HTML in the Showcase page? I think that if the width="800" is removed from the image, it degrades more gracefully... the banner looks slightly fuzzy if you've seen the original, but it fills the space and doesn't look like the banner-maker messed up.