When I download a jQuery-ui theme, what do I have to add to get the defaults looking the same as in the jQuery-ui demo page?
The dialog I’m seeing out of the box is HUGE (see below). I know all the css is available to me from the demo page, but I’m not really a CSS expert, and don’t know what to take, and what to leave.

EDIT
Here’s a jsFiddle link showing the same.
EDIT
I see what the issue is 😛
The sizes are relative to the page (more of a fluid layout). So (at least in the fiddle) changing the font-size of the body fixes it. Just change your pages’ font sizes and the dialog will change with it.
http://jsfiddle.net/hnBmC/