How to increase space between an element and its immediate children?

[Akira]

I have been able to increase the space between paragraphs with

li {
  margin-bottom: 10px;
}

However, the problem still persists with a parent and its children

and

Could you please explain how to fix this error?

A.zip (8.1 KB)

[hua]

I think you can easily get answers from google.

[nlmha]

Have you tried margin-top?

[Akira]

This works