.main_banner{
	width: 100%;
	height: 73px;
	background-color: #EEEEEE;
	text-align:center;
}
.main_logo{
	background: url("../images/school_name.jpg");
	width:700px;
	height:73px;
	float:left;
	background-repeat: no-repeat;
}
.ope_describe div{
 	font: 12px/22px Verdana,SimSun;
}