Homework 3

1.  The CSS box model is pretty much a box that wraps around every HTML element.
    The content, where text and images appear, is the center of the box. 
    There is a padding layer around the content box, a border layer around the 
    padding layer, and finally a margin layer around the border layer. Both the
    padding and margin layers are transparent.

2.  Difference between margin and padding
3.  How is total heigh and width of an HTML element determined
4.  explain this CSS property: padding: 25px 50px