Style me via the external method!

I would like to be styled with the internal method, please.

Number 1 - I'm a class!

Number 2 - I'm one ID.

Number 3 - I'm a class, but cooler!

Number 4 - I'm another ID.

Number 5 - I'm a class!

Woman with glasses Man with surprised expression
Woman with glasses Man with surprised expression

This should be styled.

This should be unstyled.

This should be unstyled.

This should be styled.

This should be styled.

I'm just a paragraph with extra bold text!

I'm a smaller paragraph, also with extra bold text!

I'm a div with thin text!
I'm a div with thin text and a child div!
I'm a smaller child div with extra bold text.