[docs] [issue25730] invisible sidebar content with code snippets

[hiroaki itoh]

hiroaki itoh added the comment:

Because there are a couple of ways (places) to fix this, I'll try them, so please wait. For testing, I think we can only visit all htmls manually and I'll make an effort.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25730>
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