Box Model
Figure
box-sizing
border-box
4rem
content-box
10rem
Selectors
Attribute Selectors
Positional Selectors
:nth-child(2n + 1):nth-child(2n):nth-child(2n + 1):nth-child(2n):nth-child(2n + 1)
:nth-child(2n + 1):nth-child(2n):nth-child(2n + 1):nth-child(2n):nth-child(2n + 1)