Interesting service. I've seen other places doing the same, and I really should brush up on my IPv6 knowledge..
As a side-note; I'm getting mixed-content warnings when accessing your website. You have the PureCSS framework included with a http link, instead of https. yui.yahooapis.com doesn't support https, so you need to host it yourself to get rid of this warning. You also have a picture hosted on imgur.com, which does support https.
Maybe consider updating your links to not include http/https and just use :// instead?
You could probably also save some bandwidth, because you're only displaying the top 400 pixels of that background image. There's no need to load the entire thing.
As a side-note; I'm getting mixed-content warnings when accessing your website. You have the PureCSS framework included with a http link, instead of https. yui.yahooapis.com doesn't support https, so you need to host it yourself to get rid of this warning. You also have a picture hosted on imgur.com, which does support https.
Maybe consider updating your links to not include http/https and just use :// instead?