Understanding Bootstrap's "col-x" Classes

I didn’t read all of the thread yet, but are we just talking about the device mode here?

If so try adding the meta tag to the head (Settings > HTML > click the button “↑ Insert the most common viewport meta tag”).

<meta name="viewport" content="width=device-width, initial-scale=1">

Edit: The viewport meta tag is also missing from your GitHub page so that would be affected as well. Just add the meta tag to the head and the device mode should work there as well.

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