Bug summary

The widget background color is hardcoded white 3c83237#commitcomment-56308727

Code for reproduction

from matplotlib.backends.backend_gtk3cairo import FigureCanvasGTK3Cairo

x = FigureCanvasGTK3Cairo()

Actual outcome

background color is white

Expected outcome

background color can be configured transparent or other color

Operating system

No response

Matplotlib Version

https://files.pythonhosted.org/packages/11/6b/9c6bb4c1e8380d16dfb78709e907a469bf0ddb12a55249a15c3f15717862/matplotlib-3.4.3-cp38-cp38-manylinux1_x86_64.whl

Matplotlib Backend

gtk3cairo

Python version

No response

Jupyter version

No response

Other libraries

No response

Installation

No response

Conda channel

No response