This reverts commit b7e0d9b1.

Defines the highlight colour when selecting slide content using Mozilla
Firefox to match other browsers, instead of being the default colour.

The alignment information were already in the generated html.
The css was the only thing missing, so I added it.

move the slide-number out of the controls to a proper position and little fix to the updating event.

the *.min.js didn't chaged yet.