Blacksmith to control a large set of headers font size

Hello folks, what’s up ? :star_struck:
I would like to control the font size, the “Typeface number”, the background and the padding of a large set of headers via Blacksmith. What is the best way to do it please ?
All of the settings in Blacksmith are clear except for the font size… I can’t find a way to adjust the General Tag “H1” “H2” “H3” etc…
In Class selector, should I use the “Font size” section ? And start my headers from H2 for example ?
Thank you for your help :slightly_smiling_face:

Hello Foundriers, no suggestion ? :innocent: