Fix Issue MarkdownWrapper

[vabelha]

Issue In certain pages the markdownwrapper reaches the specified max-width of 850px. This ends up forcing the parent div to wrap and overlap ToC div in windows under 1440px as seen in - thepracticaldev/dev.to#6922

Proposed solution In order to create a solution for this specific case and not change the current css or alter the visualization for bigger screens, I ended up just creating a media-query.

[coveralls]

Pull Request Test Coverage Report for Build 285

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 59.959%

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Totals
Change from base Build 271:	0.0%
Covered Lines:	391
Relevant Lines:	678

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💛 - Coveralls