C# language chooser changes unexpected styles on page

[susanev]

originally reported by @infin8x

On docs pages with language choosers, choosing C# appears to mess with margin and/or padding of the whole page.

Expected behavior

Choosing any language shouldn't affect any styles outside of the code block.

Current behavior

Choosing C# seems to affect margin and padding on the rest of the page.

Steps to reproduce

1. Navigate to docs/get-started/kubernetes/review-project/
2. Click C#

there's also a video in https://github.com/pulumi/pulumi-hugo-internal/issues/72