如何让jupyter笔记本中的小部件可滚动？

from IPython.display import display
from ipywidgets import Output, VBox, Scrollbar

output = Output(layout={'height': '300px', 'overflow': 'scroll'})
scrollbar = Scrollbar(orientation='vertical')

box = VBox([output, scrollbar])

def update_scroll_range(change):
    scrollbar.max = output.scroll_height
    scrollbar.min = 0
    scrollbar.value = output.scroll_y
    scrollbar.step = 1

def update_output_scroll(change):
    output.scroll_y = scrollbar.value

scrollbar.observe(update_output_scroll, 'value')
output.observe(update_scroll_range, 'scroll_height')

display(box)