Update CSS of timeline widget

Hello, I would like to update/modify the css of an joomla plugin ArtTimeline. I want to keep this update as simple as possible (there will be more in the future) The plugin has been installed and we have existing timeline and data to work with. The plugin is: - [login to view URL] - [login to view URL] - [login to view URL] - [login to view URL] This plugin is based upon the MIT widget: [login to view URL] The docs can be viewed at: [login to view URL] I want to 1) update to general look and color to be similar to the attached image. 2) Add a “more” button and function to the pop up bubble similar to the “more” bubble at: [login to view URL] 3) Enable a pop screen with the additional content similar to when you click on the more button at [login to view URL] Familiarity and past experience w/ this widget is a plus.