How can one add custom CSS to the Pop-up Sidebar component? I don’t see anywhere to add custom css like the other sections / components? Am I missing something?
Indeed you’ll need to add the custom CSS to the Menu container inside the section. The Pop-up Sidebar section is focused on handling the interaction effects of the popup.
May I ask what custom CSS you wanted to add?
This will help us figure out if it’s something we should add to the section or if it’s something you can achieve with custom CSS on the Menu container.
Okay all good 
I was using a backdrop-filter
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