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So I've figured out how to do the CSS Styling on the Gallery, and it wasn't the easiest to figure out, took quite a bit of peeking, and because of this, I'm here to share some tips on how to style your Gallery. Unfortunately I don't have any images to show you, but I will try and make it as simple as I can when explaining.
To add a CSS style to your gallery, you can only do them the folders, not the main gallery, so go to your folder and click on Edit, then click on Options and Style, you should now see a text box for your CSS to go in. In order to know what each element does, I would suggest in using it, then click on OK, then open up the styles box again and do the next part so you can see what is what. I'm going to start with the main elements for this How to just to get you started.
This is what controls the background, fonts and colours. Say you wanted a black background with white text with