How to apply style only to first child and/or only to children other than the first child

CSS :first-child Selector

The :first-child selector is used to select the specified selector, only if it is the first child of its parent.

CSS Syntax

:first-child {
  css declarations;
}

Use this code to select and style every i element of every p element, where the p element is the first child of its parent:

p:first-child i {
  background: green;
}

To select and style the first li element in lists, use this code:

li:first-child {
  background: green;
}

How to select all children other than the first one?

CSS Syntax

:not(:first-child) {
  css declarations;
}

Use this code to select and style every i element other than the first child of every p element. Same example as above but with NOT first child.

p:not(:first-child) i {
  background: green;
}

To select and style all the li elements other than the first in lists, use this code:

li:not(:first-child) {
  background: green;
}

If you want to select and style all the children other than the first of every ul element, use this code:

ul > :not(:first-child) {
  background: green;
}