WordPress: Change responsive CSS for Galleria Galleria

Hi, I'm building a website for a client. The client is a local newspaper. The website is nearly finished and I need some help with changing some CSS so that the images from the Galleria Galleria plugin can be viewed correctly on an iPhone. This is the website's development URL: [login to view URL] This is an example of a page where the Galleria Galleria plugin is used: [login to view URL] The problem: We use the Galleria Galleria WordPress plugin to show the pages of an edition of the newspaper. The gallery is displaying fine on a pc and an iPad. On the iPhone the images of the gallery are wider than the iPhone's screen. This is the way we want it, because the images are newspaper pages and they are sized so that they are just readable. The problem is that only the left part of a picture is visible on the iPhone and that the user cannot scroll to the right to see the rest of the picture. So once again: the image size is fine, only the user is now not able to scroll to the right, which is a problem. I have attached two screen shots made on an iPhone to clarify the problem. Preferably the solution only applies to the CSS of a Galleria Galleria page or only to pages for this custom content type, and not apply to the rest of the website. Please apply if you are confident that you can help within one week from now. Thank you very much and have a great day! Regards, Frank The Netherlands