Removing `left: -9999px` to eliminate RTL scrollbars.

Fixes #202.
Closes #202.

Using negative left CSS indents (e.g. `left: -9999px`) causes horizontal scrollbars when a document is viewed in RTL (right-to-left) text direction mode:
 &nbsp; &nbsp; http://meirkriheli.com/en/2012/10/stop-negative-left-indent-css-hiding/