How can i add background color to button area only?

How can i add background color to button area only?

if i add "background:#e7eef9;" to jQuery("#div_element").dialog, this will
be appended to whole dialog. How can i append this to button area only?
function test(buttonEl)
{
jQuery("#div_element").dialog({
resizable: false,
height:200,
modal: true,
width: 300,
buttons: {
Cancel: function() {
jQuery( this ).dialog( "close" );
}
}
});
}