Cannot find place to change font size

I have been searching for the place where I can select the font size in the text that appears at the bottom of a pangolin gallery slide show. Caption and copyright info is in yellow at the bottom.

I found where to change the color but nothing else. I looked for a css file on the server but got nothing.

Please point me to the right place.

I think that needs to be changed with custom css.
This appears to be the selector:

.fancybox-caption-collapsible .fancybox-caption

As an aside, you can find the css file by going to the page source code (right-click and choose “View Page Source” and clicking on the link in this line:

But it’s much easier to find the correct selector by using the browser inspector.
More here

Actually, that stylesheet is only for FontAwesome. Don’t mess with it. Backlight’s styles are typically in .../style.css....

But the best way is to use the inspector, as Rod suggests.

Oops. screen capped the wrong one. Got it right in the post I linked to though.

The funny thing is that I checked to make sure I had the correct one and then snagged the wrong one.
Glad you caught that.