margin and padding
margin 0 padding 0 / m0p0
margin 0 padding 0 / m0p0
margin 20 padding 0 / m2p0
margin 0 padding 0 / m0p0
margin 0 padding 10 / m0p1
margin 0 padding 0 / m0p0
margin 20 padding 10 /m2p1
margin 0 padding 0 / m0p0
margin 0 padding 0 / m0p0
参考:
http://www.shoshinsha.com/hp/ref/css/p-m.html
http://www.shoshinsha.com/hp/ref/css/line-height.html