The footer example does not work on mobile

Created by: seyoon20087

Prerequisites

• I have searched for duplicate or closed issues
• I have validated any HTML to avoid common problems
• I have read the contributing guidelines

Describe the issue

The footer example in https://getbootstrap.com/docs/5.1/examples/footers/ does not work correctly on mobile. It looks like this on mobile:

The example should be similar to the main website:

N.B.: The other examples noted in the link above are OK

Reduced test cases

The footer example in https://getbootstrap.com/docs/5.1/examples/footers/ does not work correctly on mobile.

What operating system(s) are you seeing the problem on?

Android

What browser(s) are you seeing the problem on?

Chrome

What version of Bootstrap are you using?

v5.1.3