h1 {
  width: 500px;
  margin: 100px auto 20px;
  color: #f0f0f0;
  text-align: center;
}

.nav {
  width: 680px;
  margin: 0 auto;
  color: #fff;
  height:45px;
}

.nav_menu li { 
  line-height: 140px;
  width:110px;
  background: url(/pyfile/images/line1.jpg) left center no-repeat;
  text-align:center;
  float:left;
  font-size:15px;

}

.nav_submenu li {
  line-height: 45px;
  width:100%;

}

.nav_menu-item {
  display: inline-block;
  position: relative;
}
.nav_menu-item:hover {
  background-color: #0a5a9f;
}
.nav_menu-item:hover .nav_submenu {
  display: block;
}
.nav_submenu {
  display: none;
  position: absolute;
  width: 110px;
  background-color: #0a5a9f;
  z-index:9999;
  line-height:40px;

}
.nav_submenu-item a {width:110px; display:block;  border-bottom:solid 1px #fff; height:40px; background: #cbcbcb; color:#000; font-size:14px; line-height:40px;}

.nav_menu-item a:visited{
    color: #000;
    text-decoration: none;
}
.nav_menu-item a:link{
    color: #000;
    text-decoration: none;
}
.nav_menu-item a:hover{
	background: #0a5a9f;
    color: #fff;
	display:block;
}
.nav_menu-item a:active {
	color:#000;
	text-decoration: none;
}