Dialog Confirm

Dialog Confirm

I installed my first JQuery plugin the dialog confirm box and it works only it doesn't look quite te same. I can't figure out how to adjust the height of the box. In the sample they use a style.css but there is no example: http://jqueryui.com/dialog/#modal-confirmation

This is the box after I installed it: http://i1301.photobucket.com/albums/ag106/DanTheMan-NL/Capture_zps3579e5b7.jpg

And I guess you already know now what I think is wrong. ;-)

Any suggestions?