Vote How can I cutomize the style of cloze to make it more attractive?

I find that the style of cloze is just the same as a page-reference. I tried to customize it like this:

span.cloze {
	text-shadow: 2px 2px 2px #AE0BCE;
	background: -moz-linear-gradient(left, #FF0000 0%, #FEFD85 47%, #0BB5FF 100%);
	background: -webkit-linear-gradient(left, #FF0000 0%, #FEFD85 47%, #0BB5FF 100%);
	background: linear-gradient(to right, #FF0000 0%, #FEFD85 47%, #0BB5FF 100%);
}

But it didn’t work. How to do?