A divided area of content.
Box should not have any margins or padding so it can be used as an invisible element container, like a
alternative- An alternative style for a box e.g. an alternative background color. Implies that the content of the box is heirarchically adjacent to surrounding content.
bounded- Applies some kind of boundary so that the boxes contents appear distinct from content around the box. e.g. using a border or background color. Implies that the content of the box is heirarchically beneath surrounding content.