#solid { width: 100%; height: 630px;}
#solid ul { margin: 0px; padding: 0px; list-style: none; }
#solid ul li { position: absolute; width: 100%; height: 630px;  display: none; cursor: pointer; background-position:center center;}
#solid #btt { width: 905px; height: 55px; top: 560px; left: 50%; position: relative; margin-left: -452px; }
#solid #btt span { position: absolute; top: 15px; left: 45%; display: block; width: 30px; height: 8px; margin: 0 15px; text-align: center; background: #3d3d3d; z-index: 1000; cursor: pointer; filter: alpha(opacity=70);  -moz-opacity: 0.7;  opacity: 0.7; /*其他，透明度50%*
}