Scroll boxes just simply aren't working

["Tyler Arthur" <webforumsuser@xxxxxxxxxxxxxx>]

I'm brand-new to CSS and DW but am starting to get the general understanding of 
how things work. one problem i'm having though is scroll boxes. I open a new 
HTML document and i create a scroll box. I've done it with several different 
code variations. No matter what when i switch to the design view there is no 
scrolling possible. Please help.
 i've used this thus far.

 <style type="text/css>
 div.scroll {
 width: 300px;
 height: 200px;
 overflow: auto;
 padding: 5px;
 }
 </style>

 then......

 <div class="scroll">
 a bunch of text here................
 </div>