after upgrading from nbconvert-5.6.1 to 6.0.1, most of the format rules defined in my ~/.jupyter/custom/custom.css are ignored when exporting to html.
Inspecting the html file generated by nbconvert, I find that the styles of my custom.css file are placed at the top of the file, instead of the bottom of the style section. Many styles are then overruled by styles put by nbconvert, defined I don’t know where.
This used to work correctly in 5.61, but the output is wrong in both 6.0.1 and 6.0.2.
Is there anything new in 6.x that I should take into account, or is this just a bug?