#slider{text-align:center;margin-top:5px}#slider ul,#slider li{margin:0;padding:0;list-style:none;background:none}#slider li{width:200px;height:210px;overflow:hidden}#prevBtn,#nextBtn{display:block;width:30px;height:0;position:relative;left:5px;top:-120px}#nextBtn{left:183px}#prevBtn a,#nextBtn a{display:block;width:11px;height:16px;background:url(https://www.museum.or.jp//preload/js/images/left.gif) no-repeat 0 0}#nextBtn a{background:url(https://www.museum.or.jp//preload/js/images/right.gif) no-repeat 0 0}