Your customiser add-ons for colours works very well. I would like to put a percentage transparency / opacity on some elements – primarily the content background and potentially the menu, header and widgets.
Equally it would be nice to add borders and rounded corners etc.
I can amend the css but would like an easy reference to the css div classes for the various sections in ‘colors’.
Also I wonder if I should be doing this in a child theme? I have included your plugin simple css but wonder what will happen to custom css when your theme is updated.