Yes - but the one you want to try to copy is way more than that.
As already said you are free to take the source and "just" override the CSS in any way you want - so lots of options..
- just change the colours inside the dashboard
- customise the css within a ui_template node
- fully customise css by modifying source and rebuild
- use uibuilder project to create custom dashboard that has Node-RED comms built in
- go fully custom and use websockets and http endpoints to talk to Node-RE.
