.slider {z-index: 9;width: 675px;height: 450px;overflow: hidden;margin:0 auto;position: relative;}
.slider ul, .slider li {padding: 0;margin: 0;list-style-type: none;}
.slider ul {width: 99999px;}
.slider ul li {list-style-type: none;float: left;width: 675px;height: 450px;}
.slider .nav {position: absolute;left: 40px;bottom: 4px;}
.slider .nav span {opacity: 0.9;background: #fff;margin: 0 8px 0 0;width: 12px;height: 12px;border-radius: 8px;cursor: pointer;overflow: hidden;display: block;float: left;box-shadow: 0 1px 2px #000;}
.slider .nav span.on {background: #2e9419;}