I've created a blank div with the ID container. This will be a box around the entire website. Type something inside it so it shows up.
I added it to the stylesheet as #container, then gave it a "border:1px solid black" so we can see it.
I've also added a style for the body, made the margin 0, font-family Arial, and font-size 12px. This gives us a nicer base to work with.