Change Grid row height / padding

How do I change the row height of grids?

I added CCS for .v-grid-cell and it changes the row hight of data cells, but not the header.
I tried CSS for .v-grid-column-header-content, but it seems to be ignored.

I am using vaadin 8.1 with valo theme.

In Vaadin 8.1 you have method grid.setRowHeight(…) which sets the height of body, header and footer rows.

In Vaadin 8.2+ there is also addition methdos to set header, body footer row heights separatelly if you want to have them different.

Actually, I want all Grids in my application to have less padding than the default valo theme provides.
Is there a way to do this globally via CSS ?