CSS border: shows on desktop, but not mobile?

Jack Posted on July 9, 2017 Posted in css, web design No Comments Tagged with div border not appearing on mobile phone?

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.