Okay, found some solution for my problem:

And file themes/default/pikett.css contains:

That works like a charm - until I log in to the logbook. Then the include of the CSS in the header is garbled with some "prefix" of random chars:

And a quick check in the source code shows some bad code:

L7615: function "show_html_header"

Here css_base is a not initialized local variable of the function. In fact the above line is the only reference of that variable char css_base[1000].

The bug is still present in elog-3.1.4-611489b

Hi Andreas,

the bug you have found was already reported in an earlier issue, together with the same solution you have found.
https://elog.psi.ch/elogs/Forum/69368

Best wishes,
Sebastian

Ive just been alerted to a bug with email notifications in Elog.

Basically if your log book contains a space then the URL that is sent in 
emails when creating tickets or updating old entries doesnt put %20 (IEs 
space) inthe URL it leaves a space hense breaking the link.

for example

Correct Way prior to 2.3.8

http://192.168.0.1:99/Provisioning%20Request/35

Broken way with new version

http://192.168.0.1:99/Provisioning Request/35
                                 ^
Link is broken at this point

My config looks like this

Email Status Assigned = $Owner@abc.co.uk
Email Status Re-Assigned = $Owner@abc.co.uk
Email Status Completed = $Requester@abc.co.uk
Email "Send Update Email" Yes = $Requester@abc.co.uk
Use Email Subject = A Provisioning Ticket has been assigned to you or 
completed
Use Email From = NetworkTeam@abc.co.uk