1$('#tag-id').removeAttr('style');
2

1//removing css with jQuery. i.e: set to default 
2$( "#myElementID" ).css("background-color", "");//just blank it out

1$("#id .class").css({ 'background-color' : '' });
2
3/* 
4   As mentioned in the jquery documentation:
5   Setting the value of a style property to an empty string  
6   removes that property from an element 
7   if it has already been directly applied
8   e.g. $('#mydiv').css('color', '')
9*/

1  $("body").removeAttr("style");
2