If you want to put a horizontal line to separate items on your page it is simply the <hr> attribute.
Here are some options you can add to your line:

<hr attribute1=”..” attribute2=”..”>
Inserts a horizontal line.
Attributes:

1. size=”..” ; the thickness of the line.
2. color=”..” ; line color, Internet Explorer only.
3. width=”..” ; the length of the line.
4. align=”..” ; alignment of line: RIGHT, LEFT, or CENTER.
5. noshade ; make a solid line.