Which page did you do this on? You might need to use the browser extension for some pages. Some styles do not transfer without it. I can show you what it looks like with my browser extension if you let me know the URL you tried this on?
http://www.pcgamer.com/why-the-creator-of-dwarf-fortress-is-...
I get similar results when copy&pasting.
Still needs fixing some image proxying bugs, will work on it, thanks!