We have disabled linking to external sites from sub's stylesheets (read if you own a sub with custom styles).

Due to security and privacy reasons, linking to external sites on sub's custom CSS has been disabled. This means that - `@​import` is not allowed anymore - All custom images (backgrounds, etc) must be uploaded to our servers. We have added an uploader and instructions on the sub stylesheets page. The limit for uploaded images is 1 MiB (plus 10 kB for the CSS). We haven't strictly enforced this yet, so all subs that used `@​import` or link to external sites still preserve their styles. We will probably change that in a couple weeks.