Certificates and Tickets editing

It has taken me litterally weeks to find a way to make my ticket layout work, for some unknown reason common css parameters and table parameters dont work properly or are simply ignored.  Now I am finding the same issues with the creation of certificates.
Is there some guide availlable that will tell me what will and wont work when it comes to formatting the page, even simpky trying to centre a table within a table is impossible to get working, and it should be easier than this

Hi Craig

By default, Events Booking using TCPDF library to generate these PDF files. However, that library does not support css very well, so to make it easier to generate layout, maybe you should install and use MPDF plugin docs.joomdonation.com/eventsbooking/plugins/mpdf

It supports css very well and have good documentation, so it should be easier for you to build the layout

Regards,

Tuan