.dropdown-submenu {
  position: relative;
}

.dropdown-submenu .dropdown-menu {
  top: 0;
  left: 100%;
  margin-top: -1px;
  margin-left: -1px;
}

.navbar-nav .nav-item .dropdown-menu {
  position: static;
  display: none;
  margin-top: 0;
  float: none;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.navbar-nav .nav-item:hover > .dropdown-menu,
.navbar-nav .nav-item .dropdown-menu:hover {
  display: block;
  animation-name: fadeInUp;
  animation-duration: 0.3s;
  animation-fill-mode: both;
}

.navbar-nav .nav-item .dropdown-menu .dropdown-menu {
  margin-left: 0;
  margin-right: 0;
  margin-top: 0;
  margin-bottom: 0;
}

@media (min-width: 768px) {
  .navbar-nav .nav-item .dropdown-menu {
    position: absolute;
    z-index: 9999;
  }

  .navbar-nav .nav-item:hover > .dropdown-menu,
  .navbar-nav .nav-item .dropdown-menu:hover {
    display: block;
    animation-name: fadeIn;
    animation-duration: 0.3s;
    animation-fill-mode: both;
  }

  .navbar-nav .nav-item .dropdown-menu .dropdown-menu {
    left: 100%;
    top: 0;
  }

  .navbar-nav .nav-item .dropdown-menu > li:hover > .dropdown-menu {
    display: block;
    animation-name: fadeInRight;
    animation-duration: 0.3s;
    animation-fill-mode: both;
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translate3d(0, -10%, 0);
  }

  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translate3d(0, 10%, 0);
  }

  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translate3d(10%, 0, 0);
  }

  to {
    opacity: 1;
    transform: none;
  }
}