Warning: dark colours won't show up!
How to draw:
Click on a square in the gray box to colour it your selected colour.
Click on it again to remove all colour.
How to change colour:
Change colour by clicking on the "Pick Colour" square. Select a colour using the colour wheel.
How to Select an existing colour:
Use "Select existing color" to pick a colour you have already used.
Click the button, then click the square with the colour you want.
sen = SenseHat()
sen.set_pixels(<Pasted text goes here>)
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