Getting the bottom of the pdf viewer to display (bug 1240776)

- change allows for a bit of the base of the display so it doesn't
look broken

Change-Id: Id4ba8c05bbfe3b3b83ac0673f68d8da345b53969
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>
Signed-off-by: Aaron Wells <aaronw@catalyst.net.nz>
Embed pdf has horiz scrollbar on default 3 column layout (bug 1237137)

Seen as the 3 column layout is the default one the embed pdf view
should fit within it.

Currently if you have a browser windo open fully, a 3 column layout,
and a pdf embedded you get a horizontal scrollbar on the embed pdf.

A slight adjustment of the min-width and it goes away.

The scrollbar will be there for 4 or 5 column widths but that is ok as
they are quite thin columns.

Change-Id: I5786920bf7ffc59e92e32d8e84b3af3f9355f76e
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>
Signed-off-by: Aaron Wells <aaronw@catalyst.net.nz>