Lines are helpful in emphasizing sections of a page. In order to create lines, you must become familiar with the following html terminology and code. (Column borders are a way to create vertical lines along the sides of columns, but do not function as flexibly as horizontal lines).
Creates lines across a page
Creates fine dotted line (along columns only). Combined with column width code, separated by a space.
careful where you place the code, especially with respect to column code.
the html code frequently reverts to a simple line. pay attention.