.markdown-body with min-height: 100vh; may not be expected

[LolipopJ]

I notice there has an update on .markdown-body recently:

github-markdown-css/github-markdown.css

Line 135 in 9ab210a

min-height: 100vh;

I think this may not be what you expect and will cause issues to the interface style.

[AndersonBY]

True. Totally messed up my markdown render page.

[wuyuetian555]

crazy！

[earlAchromatic]

@sindresorhus looks like this didn't get regenerated after sindresorhus/generate-github-markdown-css#40 which should have fixed it.

[sindresorhus]

https://github.com/sindresorhus/github-markdown-css/releases/tag/v5.8.1