How does the child element margin affect the parent element?

Child element margin affects parent element

Description of the problem: In some cases, when we set the margin value of the child element under the parent element, the parent element will be affected.
This is a common problem and only occurs in standard browsers (FirfFox, Chrome, Opera, Sarfi), IE works fine.

Cause of the problem

Solution: Add CSS code to the parent element

overflow:hidden;