Bootstrap col not works for Markdown with long code

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If a Markdown with a long code, e.g as below, it's not limited to right cols, but span all pages. e.g. This note

really long code. really long code. really long code. really long code. really long code. really long code. really long code. really long code. really long code. really long code. really long code. really long code. really long code. really long code. really long code. really long code. really long code. really long code. really long code. really long code.


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