You can change the background color of a basic venn diagram using the set_facecolor() function of matplotlib.

# Library
from matplotlib import pyplot as plt
from matplotlib_venn import venn2
 
# Basic Venn
v = venn2( (10, 20, 10), alpha = 1 )
 
# Change Backgroud
plt.gca().set_facecolor('skyblue')
plt.gca().set_axis_on()
 
# Show it
plt.show()

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