I don't trust a layout engine whose webpage advertising the engine has centering issues... iPhone 5s in portrait does not center the section starting with 'Polyfills' but does so in landscape mode; I'm pretty sure this was not the expected design.
The bottom is cut off as well. Where it says e-mail address and then something else but you cannot see it. Like this idea but this looks a bit bad for someone offering a solution to css bad parts :/
