CSS border: shows on desktop, but not mobile?

Tutoring web design, there are so many interesting details to learn. The tutor mentions a discovery.

The div below has a red border. I can see it on my desktop, but not on my mobile phone.

Can you see the border? On mobile?

 

I’ll have to find out what to do about this:)

Source:

Meyer, Eric A. CSS Pocket Reference. Sebastopol: O’Reilly Media Inc, 2004.

w3schools

Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.

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