A userscript that allows you to add one or more vertical guidelines to the code

• The userscript adds guideline(s) to code blocks.
• Customize the guideline position, color and width.
• Add as many guidelines as you desire.
• By default, one guide is set at 80 characters.
• Guidelines are added as a background linear gradient with multiple stops.
• It will not interfere if you copy & paste the code.
• The script was inspired by this thread: https://github.com/isaacs/github/issues/738.
• See the setup instructions & change log here.

* The misaligned guides inside the expanded content still align with the set position.

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