如何在ipywidgets Box中居中绘图？

import ipywidgets as widgets
from IPython.display import display

box = widgets.Box(layout=widgets.Layout(align_items='center'))

# 创建绘图
fig, ax = plt.subplots()
ax.plot(x, y)  # 假设x和y是绘图的数据

# 创建FigureCanvas小部件
canvas = FigureCanvas(fig)

box.children = [canvas]

display(box)