It would be nice to have some dark or customizable themes for SAS Studio. Since it works in the browser some browser extensions can be used, but having customizable settings in the IDE would help for programmers moving from other IDE's.
If you don't have access to these, and happen to be using Studio in Chrome, and are lazy like me, then in the meantime I've found that the Dark Reader plugin does an excellent job of applying a dark theme to Studio. You do need to make a couple of tweaks though, place these styles into the top of the custom configuration section (by clicking on the dev tools button):