#available_prefixes, #used_prefixes {
	min-width:100px;
	min-height:100px;
	padding:10px;
	margin:5px;
	background-color:#cadceb;
	float:left;
	list-style: none;
}

#available_prefixes li, #used_prefixes li {
	padding:5px;
}

li.prefix_placeholder {
	background-color:#e1ebf2;
}