.slider_banners {
 z-index: 9;
 width: 710px;
 height: 300px;
 overflow: hidden;
 margin: 0 0 7px;
 position: relative;
 }
 .slider_banners ul,
 .slider_banners li {
 padding: 0;
 margin: 0;
 list-style-type: none;
 }
 .slider_banners ul {
 width: 9999px; 
 }
 .slider_banners ul li {
 list-style-type: none;
 float: left;
 width: 710px;
 height: 300px;
 }
 .slider_banners .nav {
 position: absolute;
 left: 15px;
 bottom: 12px; 
 }
 .slider_banners .nav span {
 opacity: 0.9;
 background: #fff;
 margin: 0 8px 0 0;
 width: 16px;
 height: 16px;
 border-radius: 8px;
 cursor: pointer;
 overflow: hidden;
 display: block;
 float: left;
 box-shadow: 0 1px 2px #000;
 }
 .slider_banners .nav span.on {
 background: #2e9419;
 }