.main_nav { width: 900px; height: 44px; line-height: 44px; }
.main_nav ul li { float: left; width: 111px;  /*主菜单栏目单宽*/ height: 44px; border-right: 0px solid #666; position: relative; line-height: 44px; }
.main_nav ul li a { display: block; height: 44px; line-height: 44px; text-align: center; color: #ffffff; text-decoration: none; font-size: 14px; font-weight: bold; }
.main_nav ul li a:hover { color: #015EBB; font-size: 14px; background: url(../images/menu1.jpg) center no-repeat; height: 44px; line-height: 44px; font-weight: bold; }
.main_nav ul li dl { position: absolute; left: 0; top: 44px; width: 111px;/*子菜单栏目单宽*/ display: none; }
.main_nav ul li dl dd { height: 30px; /*子菜单栏目单高*/ }
.main_nav ul li dl dd a { display: block; height: 30px;  /*子菜单栏目单高*/ line-height: 30px; text-align: center; color: #fff; background: #015EBB; border-bottom: 1px solid #666; font-size: 14px; font-weight: normal; }
.main_nav ul li dl dd a:hover { background: url(../images/menu1.jpg) center no-repeat; color: #015EBB; font-size: 14px;height: 30px;  /*子菜单栏目单高*/ line-height: 30px;  }
.click { margin-top: 200px; }