Added max-width to videos to prevent them escaping the page content area

[snowc0de]

This is to prevent that videos included in pages don't exceed the page border. This is to avoid the following issue:

Which now becomes this:

I didn't build the project and only added the CSS code into my instance's "head config" but as far as I know this fix should work.

[ssddanbrown]

Thanks for offering. Setting a width could cause further issues though (videos with pre-defined sizes, videos smaller than the page width). Instead, a max-width may be a better approach, within our page content style block so its clear this rule relates to video in page content (Rather than in the CSS reset).

[snowc0de]

Thanks for the feedback @ssddanbrown, I just made the change :)

[ssddanbrown]

Thanks for updating @chopin2712. Will merge for next release.

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Weakly related to #1760

[JNR8]

Did this get implemented? My videos till break page width on mobile devices.