This is a box:
This box has a margin which indents the image from the edges of the page. Margins aren't colored:
This box has a margin which indents the image from the edges of the page, and padding which indents the image from the background. Padding can be colored:
This box has a margin which indents the image from the edges of the page, padding which indents the image from the background, and a grooved border:
This box has a margin which indents the image from the edges of the page, and padding which indents the image from the background, a dashed border, and the side, top and bottom vales are all different: