how to dram line around table??

[yunakokimama]

There is line around table or Div.
You can see the line around table in this web. How can I show line?
I setup CSS in dreamweaver 8, ( BORDER Pixel 3, solid), but it doesn't show any line. WHY??

[Wickham]

Try
<div style="border: 3px solid black;">......</div>
or
<table style="border: 3px solid black;"><tr><td>.....</td></tr></table>