0.5em Margin h1, No padding

0.5 em margin paragraph, no padding, with enough text to span multiple lines.

0.5em Padding h1, No margin

0.5 em padding paragraph, no margin, with enough text to span multiple lines.

0.5em Margin h1, 0.5 em padding

1 em margin paragraph, 1 em padding, with enough text to span multiple lines.