Change Line Height

Hi there,

I activated the Apex theme yesterday and upgraded to the customizer.

I’m trying to change the line height / leading of the body text in my site. However, when I changed the line height in the code editor nothing happened. I would also like to see what it looks like in a larger font, but my changes to the font don’t seem to have an effect either.

I would greatly appreciate any help.

Many thanks,
Olivia