[Python] How to change ttk.progressBar color in python

Does anyone know how I can change the color of my ttk.progressBar? It now shows a green color, and I would love to have it blue.

import ttk
self.progressBar = ttk.Progressbar(frame3, length=560, maximum=100, mode='determinate');
self.progressBar.place(x=-5, y=60)

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