用户如何在rails应用程序中修改颜色、页面和标题?

I need to create a single page website using ROR which allows the users to modify the styling of that page. At a minimum, the user should be able to change the colors, title, and font on the page, but should not be able to modify the controls for styling the page. Data should be saved via ActiveRecord and changes should persist sessions.I need to create a single page website using RO