JQuery UI Dialog Box: How can I make the buttons and fonts smaller?

JQuery UI Dialog Box: How can I make the buttons and fonts smaller?

I know it sounds like a lame question, but I am new to JQuery UI and an intermediate CSS person.  How can I make the fonts and buttons in a JQuery UI dialog box smaller?   Which file and CSS definition would I go to....or would I make my own CSS.   I'm using the microsoft/redmond theme.

Thanks much in advance for any tips

Steve