This is a style sheet I created to rearrange and simplify the OctoPrint interface to fit on vertical screen. The focus is on making all the most common controls, the terminal, as well as all the relevant status indicators available on one screen without having to scroll or navigate tabs.
Using this style sheet does not affect the layout of OctoPrint on typical viewport dimensions, so you should only see it if you make the window full-screen on a vertically-oriented monitor.
To use this theme, install the Custom CSS plugin, and paste the contents of theme.css into the text area.