nav ul {
  list-style: none;
  padding-left: 0;
  margin-top: 0;
  margin-bottom: 0;
}

h1 {
  width: 1200px;
  margin: 100px auto 20px;
  color: #f0f0f0;
  text-align: center;
}

.nav {
  width: 1200px;
  margin: 0 auto;
  background: #c41921;
  color: #f0f0f0;
}

}
.nav_menu {
  line-height: 40px;
  font-weight: 700;
  text-transform: uppercase;
}
.nav_menu-item {
  display: inline-block;
  position: relative;background:url(http://www.sdruiguan.com/images/nnav_abg.jpg) no-repeat right;
}
.nav_menu-item:hover {
  background-color: #990000;
}
.nav_menu-item:hover .nav_submenu {
  display: block;
}
.nav_submenu {
  font-weight: 300;
  text-transform: none;
  display: none;
  position: absolute;
  width: 160px;
  background-color: #990000; margin-top:40px;
}
.nav_submenu-item:hover {
  background: rgba(0, 0, 0, 0.1);
}