[docs] [issue24712] Docs page's sidebar vibrates on mouse wheel scroll on Chrome.

[Mike Taylor]

Mike Taylor added the comment:

The bug for Chrome to ship support of position: sticky is here: https://bugs.chromium.org/p/chromium/issues/detail?id=231752 -- it's in active development.

But this patch fixes the jerky sidebar in Firefox as well.

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<http://bugs.python.org/issue24712>
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