Before you go around throwing accusations everywhere, do some research. This is the same CSS used by thousands of other sites, Bootstrap.(http://getbootstrap.com)

EDIT: Such as:
Blockchain.info http://gyazo.com/a2fcc43eb3b97e7a0729f3cbaa7fccbb
Coinchat.org http://gyazo.com/4cf525ac9ad48aaa65cb7a2cfa5919f2

And a whole hell of a lot of others.