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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Andreas_Rozek
To set it globally go into the settings App, under System, select Theme.
There are 2 themes defined, a black on white and a white on black.
You can them customise the actual settings on one of more of the attribute.
In that way you can define you own theme.