.sidebar-nav {
  padding:9px 0;
}

.dropdown-menu .sub-menu {
  left:100%;
  position:absolute;
  top:0;
  visibility:hidden;
  margin-top:-1px;
}

.dropdown-menu li:hover .sub-menu {
  visibility:visible;
}

.dropdown:hover .dropdown-menu {
  display:block;
}

.nav-tabs .dropdown-menu, .nav-pills .dropdown-menu, .navbar .dropdown-menu {
  margin-top:0;
}

.navbar .sub-menu:before {
  border-bottom:7px solid transparent;
  border-left:none;
  border-right:7px solid rgba(0, 0, 0, 0.2);
  border-top:7px solid transparent;
  left:-7px;
  top:10px;
}

.navbar .sub-menu:after {
  border-top:6px solid transparent;
  border-left:none;
  border-right:6px solid #fff;
  border-bottom:6px solid transparent;
  left:10px;
  top:11px;
  left:-6px;
}