How to have a transparent figure with a darkgrid background in seaborn?

The default behavior when saving a transparent image is to set the background to be transparent, but I want the background as is, and the white space surrounding the plot in the figure to be transparent.

import matplotlib.pyplot as plt
import seaborn as sns
import pandas as pd
import numpy as np

%load_ext autoreload
%autoreload 2
%matplotlib inline
%config InlineBackend.figure_format = 'svg'

tips = sns.load_dataset("tips")

# Set background of the charts' to be a dark grid.
sns.set_style("darkgrid")

g = sns.FacetGrid(tips, col="smoker", col_order=["Yes", "No"])
g = g.map(plt.hist, "total_bill")

# Save figure with a transparent background (but this unfortunately)
# overrides the dark grid, whereas I want the white surrounding the
# plots to be transparent.
plt.savefig("example.pdf", transparent=True)

Figure as shown in the notebook (with the darkgrid)

Figure as it looks saved (no background)