Center text and buttons. Joomla. Ignite Gallery

Hello all, I have a little problem with my website. When someone click the images to enlarge, if the resolution screen have not 1920 px wide, some text, button or stars rate dissapear. They cant see this info. Here some examples (see too the file attached) [login to view URL] So, I want to center all this buttons and text, but only in lighbox image (large image), then people will see the text and buttons, though people can't see the whole image. I have attached an image how I think it would be. As well, I need the code lines that you modify because I need change this issue every time Ignite Gallery launch a new update. Sorry for my english. Best Regards. Manuel