I'm sure this is possible but I can't find where or how. Can anyone help?

1. How do you change the colour of the info panel box (containing the caption) in the lightbox?

2. Is there an easy way to centre the text? Other than adding code to every caption.

Thanks very much for the helpful suggestions but I am still having problems here:

1. I can change the box colour but the colour codes from elsewhere in the settings seem to have a strange effect here. For example, I tried making the box effectively invisible by using the same mid-grey colour as the lightbox background, #ff666666 in my case, taking this from lightbox | settings | background colour. But I get a strange dark red.

2. The box containing the buttons next to the caption isn't included in lightbox-caption. Can I similarly identify this in the custom CSS?

3. The text doesn't centre when I use the code you suggested. It is actually already centred on my phone, but on my PC it's aligned left, which tends to look a bit scruffy when some lines of the caption are quite long.

I haven't made these changes on my live site but you can see it at https://robertcunnew.uk

Regardless of what version of Tiger you're using, if you can target the correct CSS class(es), you should try this if you're trying to get rid of a differing background color:

background-color: transparent;

That often avoids the kinds of transparency collisions you're running into. The CSS classes will be different in an older version than they are in the current version.

Caption entering in that older version of Tiger would be very difficult, indeed. The newest version centers by default.