/* 默认隐藏子菜单 */
.menu #nav_list {
  display: none;
  position: absolute;
  top: 100%;   /* 紧贴父菜单下方 */
  background: #f8fbff;
  z-index:100;
  margin-left:-25px;
}

.menu #nav_list li {
  float: none!important;
}

/* 鼠标悬停时显示子菜单 */
.menu ul li:hover #nav_list{
  display: block;
}

.menu #nav_list a { color: #003366!important; }
.menu #nav_list a:hover { background: #e6f2ff!important; }