Playgrounds on codedamn are awesome - they allow you to practice in real environments without worrying about breaking anything. A codedamn playground provides you the interface to practice and learn when you're completing a course. However, since beginning, we only allowed one terminal per playground, i.e. if you were running a server and wanted to do something else, you will need to quit that server to get back to bash.
Introducing 2nd terminal support
When you are on a codedamn playground screen (whether inside a lab or on the real playground), click on the split terminal icon you see on the top right inside terminal screen and voila! You should have another terminal connected to the same computer at your disposal.
Try it out on the HTML/CSS playground here