.main{ margin:0 auto; overflow:hidden; min-height:555px; }
.tb{ width:47px; height:47px; margin-top:20px; margin-left:20px; float:left;}
.bt{ border-bottom:2px solid #d43700; width:878px; height:45px; margin-top:20px; margin-left:10px;  float:left;}
.bt_bt{ width:400px; height:45px; float:left;}
.bt_mz{ width:400px; height:44px; font-size:20px; font-weight:bold; float:left; padding-top:6px;}
.bt_py{ width:400px; height:23px; font-size:13px; float:left;}
.bt_nf{ height:45px; float:right;}
.nr{ margin-left:20px; margin-bottom:20px; width:960px; float:left;}