Sorry HT, didn't spot these comments earlier.Brilliant stuff, but why can I not go back to black and where is the widget for cut and past?
You should be able to switch between the light and dark themes using the link on the bottom right corner....
There isn't a Cut/Paste button in the new editor. Keyboard shortcuts of Ctrl+C/Ctrl+V are more standard these days. You can of course also 'right-click' and use the context menu too.
The left most button may be useful when you copy/paste stuff on to the editor, as it will strip out all the associated formatting. Highlight what you paste, then click that and all the code will be stripped!