In our gallery every image have title, caption and description text. Every of this text element could be configured in gallery settings section. If you wish to customize styles of the gallery interface some way which do not represented in settings section please explain more detailed which exactly changes do you wish to do.
Actually not every interface element of the gallery available for some CSS edit in file. For some gallery elements styles generated in another code structures dynamically.
So here’s few options use gallery settings for text configuration of if you need some customization please explain which exactly and we’ll try to find most simple and effective solution for your gallery case. Let me know.