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//removing css with jQuery. i.e: set to default
$( "#myElementID" ).css("background-color", "");//just blank it out
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$("#id").css("background-color","");
$("#id").css("opacity","");
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$("#id").css({ 'background-color' : '', 'opacity' : '' });
$(".class").css({ 'background-color' : '', 'opacity' : '' });
//You can remove css by the above.
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$("#id .class").css({ 'background-color' : '' });
/*
As mentioned in the jquery documentation:
Setting the value of a style property to an empty string
removes that property from an element
if it has already been directly applied
e.g. $('#mydiv').css('color', '')
*/