Update example/mocha.css.
Update example/mocha.css.

Add missing vendor prefixed properties and fix font-size for `#error`.

mochajs/mocha,boneskull/mocha,hoverduck/mocha,igwejk/mocha,hoverduck/mocha,hoverduck/mocha,igwejk/mocha,adamgruber/mocha,boneskull/mocha,adamgruber/mocha,hoverduck/mocha,mochajs/mocha,boneskull/mocha,outsideris/mocha,adamgruber/mocha,mochajs/mocha,outsideris/mocha