pie label is cut when width is small.

[yllgl]

Describe the bug
if original width is small, then we only see the pie, but can't see the labels.

To Reproduce
Open mermaid-live-editor , write some pie diagram's codes.
I use Chrome, so I press F12 to change the body's width. Then click the refresh button. Then we can see the pie's label is cut.

Expected behavior
I hope the figure can zoom out to the original width so we can see the label.
For example,

Screenshots
If original width is small, then we can't see the labels.

Desktop (please complete the following information):

• OS: win10
• Browser chrome
• mermaid Version 8.8.4