Increase entire grid point size

I tried changing the dhtmlxgrid.css from 12px to 16px and it did nothing. How do I increase the labels, cells, and text in the cells to a larger point?

Please, try to use the skin builder for the skin customizing:

Hi Support
Can you help a bit further it is version 3 and I cant yet get management to upgrade and the skin builder cant be found.

The following css will change the font size in your grid:

div.gridbox_dhx_skyblue table.obj tr td{