I seek an expert in the design and customize the theme of the open journal system OJS 3X). I plan to create two journals with different colors (sub-pages) using the same theme. There is one main page that I can use to navigate to the needed journal ( OJS1, OJS2). Something like this: [login to view URL], with a more modern design.
I already installed OJS with default Manuscript theme for the main journal (interface), but was not able change the theme for the sub journals.