.slider{display:none;width:100%;position:relative}
.slider .screen{width:100%;overflow:hidden}
.slider .btn{width:12.5%;height:100%;position:absolute;background:#000;background:rgba(0,0,0,.6);filter:alpha(opacity=60);z-index:99;cursor:pointer}
.slider .btn i{position:absolute;width:39px;height:66px;top:50%;left:50%;margin-left:-19.5px;margin-top:-33px;background-image:url(../img/arr.png);background-repeat:no-repeat}
.slider .btn.prev{left:0}
.slider .btn.prev i{background-position:0 0}
.slider .btn.next{right:0}
.slider .btn.next i{background-position:-39px 0}
.slider .list{width:100%;overflow:auto}
.slider .list li{float:left}
.slider .list li img{width:25%}