Enfold: changing opacity of inactive accordion slider overlay

I need to change the opacity settings for the inactive slides in a full page width accordion slider. The black overlay has an opacity of something like .7 when inactive and it’s too dark for me–makes it oppressive. I need to change that. I looked all through the .js files and can’t find anything. Nor in the .css files.

Can you tell me how to do this? I’d like to have control over the opacity and be able to set it so it won’t get overwritten with a theme update. This is the page in progress – http://novabook.us/novabookblog/ – I usually can do this in a .js file, but can find nothing.

I found #post-29842, but that didn’t help as there is no “custom.js”.

Hope you can help!

Thank you.

– Michael