class for jquery ui datepicker button

I have the following code for the jQuery UI datepicker:

$(function() {
        $(".date").datepicker({
            showOn: 'button',
            buttonText: "Choose Date",
            dateFormat: 'yy-mm-dd'
        });
    });

It creates a button on the side of the text box so people can click the box and select a date. Is it possible to apply a class to the button that is created so I can apply a CSS style to it?