body {font-size:14px;}

#size .li1 a {background-position:0 0px; width:27px;}
#size .li2 a {background-position:-27px -94px; width:27px;}
#size .li3 a {background-position:-54px 0; width:35px;}

#size .li1 a:hover {background-position:0 -47px; width:27px;}
#size .li2 a:hover {background-position:-27px -94px; width:27px;}
#size .li3 a:hover {background-position:-54px -47px; width:35px;}