Bug 31750: Need more padding in cataloguing

Bug 31750: Need more padding in cataloguing

This patch makes some minor tweaks to the CSS controlling the appearance
of the toolbar shown in the basic cataloging editor.

To test, apply the patch and go to Cataloging -> New record.

- Confirm that the page looks correct, with the toolbar the same width
  as the main content of the page.
- Confirm that the toolbar looks correct when you scroll and the toolbar
  "floats"

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>