.step{display:block;width:960px; margin:5px auto;height:auto;}
.step2{display:block;width:1020px; margin:5px auto;height:auto;}
.steptable{display: block;width:1150px;margin:5px auto;height:auto;}
table{font-size: 14px; width:1150px; }
.b_banner{ width:960px; height:330px; margin:0 0 30px; position:relative; overflow:hidden;}
.ppt_control {top:145px;left:0px;position: relative;z-index: 6;text-align: center; margin:0 auto;}
.train{display:block;width:960px; margin:5px auto;height:auto;}
.train ul{margin: 0px 10px; text-align: center;}
.train li {float: left;width: 302px;margin-right: 10px; height: 47px;}
#li1 {background: url(/images/teacher/li1_a.jpg) no-repeat;}
#li2 {background: url("/images/teacher/li2_a.jpg") no-repeat;}
#li3 {background: url("/images/teacher/li3_a.jpg") no-repeat;}