Recreating a style sheet
My team is planning to upgrade from RH2019 Classic to RH2020. We haven't used RH2019 new UI because our project does not convert to the new UI style. We have a style sheet that is multiple generations of RoboHelp old, so I want to recreate it in RH2020. I have two questions:
1.) The default css in RH2020 has blank spaces. For example, the Font Size, Line Height, and Text Alignment are all blank. But they obviously have a size/spacing in the preview. Where is this information coming from?

2. The old style sheet in RH2019 Classic has strange sizes. For example, this is our H1 in the project. Is there anything that tells me what size "x-Large" is?

