direction:ltr, narrow

margin-left and margin-right auto
margin-left auto
margin-right auto

direction:ltr, wide

margin-left and margin-right auto
margin-left auto
margin-right auto

direction:rtl, narrow

margin-left and margin-right auto
margin-left auto
margin-right auto

direction:rtl, wide

margin-left and margin-right auto
margin-left auto
margin-right auto