It's totally awesome but a bit more space around the preview would be great. I'm on an iPhone 6 Plus running the iPhone Chrome browser and I can't actually see the bottom of the linked preview pane, nor can I scroll down to see the bottom of it (trying to scroll down just invokes the refresh action in the browser)
Thanks for letting me know! I had tested it in Chrome's mobile simulator, and checked that it loaded on my phone, but hadn't actually tried scrolling. Will see if I can find a fix.
I'm kinda surprised that it works on phones at all - I'd really only been targeting browsers (because you don't usually do much coding on a phone), but other than the scroll issue it seems to work pretty well.