outer width=400 align=center
outer width=400 inner width=200 align=center
foo
outer auto inner align=center
foo
outer width=50 inner align=center
foo
outer width=50 inner margin-left:50
foo
outer width=400 inner align=center
foo
x x x x x x x
outer width=400 inner align=center
50
x x x x x x x
-->