div.viewport {float:left;width:420px;overflow:hidden;}
div.portfolio-thumb {position:relative;width:388px;height:400px;overflow:hidden;float:left;}
ul.portfolio-thumb {position:absolute;width:1940px;left:0px;}
ul.portfolio-thumb li {display:block;float:left;width:388px;text-align:center;background:url(images/shadow.jpg) no-repeat bottom;height:360px;}
.arr {position:absolute;cursor:pointer;top:110px;}
.rarr {right: 0;}