They didn't use borders there; they utilize cellspacing on a white background.
Code:
<table border="0" cellpadding="2" cellspacing="1">
In dreamweaver, you can utilize that in the code view, or by using the CSS properties on the right.
If you wish to have a coloured border that is separate from your background colour, then consider:
Code:
<table cellpadding="2" cellspacing="0" style="border: solid 1px #000000;">