How to do it...

To do this, perform the following steps:

1. Run the following lines of code in the REPL:

>>> from adafruit_circuitplayground.express import cpx
>>> cpx.pixels.fill(0x0000FF)

1. You should see all 10 NeoPixels turn blue.
2. Use the following code to turn off all 10 NeoPixels:

>>> cpx.pixels.fill(0x000000)