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

.nav {
  margin: 0 auto;
}
.nav a {
  display: block;
  line-height: inherit;
  cursor: pointer;
}
.nav_menu {
  line-height: 50px;
  text-transform: uppercase;
}
.nav_menu-item {
  display: inline;
  float:left;
  position: relative;
}
.nav_menu-item:hover {
  background-color: #f3f3f3;
}
.nav_menu-item:hover .nav_submenu {
  display: block;
}
.nav_submenu {
  text-transform: none;
  display: none;
  position: absolute;
  background-color: #f3f3f3;
  z-index:9999;
}
.nav_submenu-item:hover {
}