Since 1996 CSS1 the launch of the w3c organization on the proposal on all pages are on the right as a box (box), the designer can create this box to control the definition of the attributes, including paragraphs like these, the list, Heading picture, as well as layer <div>.    Box Model definition of the four main areas: content (content), from the borders (padding), Border (border) and the Margin (margin).    We are talking of the above is a typical sample of the box.    For beginners, often in confusion margin, background-color, background-image, padding, content, the border between the level of relations and mutual influence.    Here to provide a 3-D model box diagram, you hope that the ease of understanding and memory.