Specificity Rules
IDs (1,0,0) — each #id adds
1 to the ID column
Classes/Attributes/Pseudo-classes (0,1,0)
— .class, [attr], :hover, :nth-child()
Elements/Pseudo-elements (0,0,1)
— div, ::before, ::after
Inline styles (1,0,0,0) beat all selectors; !important overrides
everything