Letter Head Customization w/ table padding

Hello there,

I have a Letter Head / Footer in our ERPNext with a html table. The problem that we have is, that I can not adjust the padding of the td-cells. I have tried e.g.

.print-format {
padding-top: 0mm !important;
padding-left: 0mm !important;
padding-right: 0mm !important;
padding-bottom: 0mm !important;
and other variations, but the padding does not change in the print format.
Any ideas?

you can edit this in print format