.main-navigation .submenu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 200;
  min-width: 230px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: #005f5f;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
  border-top: 2px solid #00a0a0;
}

.main-navigation .submenu li a {
  display: block;
  color: #e0f5f5;
  padding: 10px 16px;
  text-decoration: none;
  font-size: 13px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.main-navigation .submenu li a:hover,
.main-navigation .submenu li a[aria-current="page"] {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.main-navigation .has-submenu:hover > .submenu,
.main-navigation .has-submenu:focus-within > .submenu {
  display: block;
}

.main-navigation .submenu .submenu {
  top: 0;
  left: 100%;
  border-top: 0;
  border-left: 2px solid #00a0a0;
}

@media (max-width: 900px) {
  .main-navigation .submenu,
  .main-navigation .submenu .submenu {
    display: block;
    position: static;
    min-width: 0;
    box-shadow: none;
    border-top: 0;
    border-left: 2px solid rgba(255, 255, 255, 0.2);
    background: rgba(0, 0, 0, 0.15);
  }

  .main-navigation .submenu li a {
    padding-left: 28px;
  }

  .main-navigation .submenu .submenu li a {
    padding-left: 40px;
  }
}