nav {
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.nav-item {
  position: relative;
  width: 16%; /* each nav item */
  text-align: center;
}

.menu-btn {
  color: var(--navy);
  background-color: transparent;
  font-size: 22px;
  font-weight: bold;
  display: block;
  width: 100%;
  padding: 20px 0;
  border: 0;
  transition: all 0.5s linear; /* button colour */
  border-bottom: 2px var(--navy) solid;
  cursor: pointer;
}

.nav-item:nth-child(1) .menu-btn {
  background-color: #bcefff;
}

.nav-item:nth-child(2) .menu-btn {
  background-color: #faa89a;
}

.nav-item:nth-child(3) .menu-btn {
  background-color: #ffc06b;
}

.nav-item:nth-child(4) .menu-btn {
  background-color: #e5e87f;
}

.nav-item:nth-child(5) .menu-btn {
  background-color: #f9e76b;
}

.arrow {
  border: 0 solid var(--navy);
  border-width: 0 3px 3px 0;
  display: inline-block;
  padding: 3px;
  margin-left: 10px;
  transform: rotate(315deg);
}

.nav-item:hover .menu-btn {
  color: #fff;
  background-color: var(--navy);
}

.nav-item:hover .menu-btn .arrow {
  border-color: #fff;
}

.nav-item:hover .menu-content {
  width: 100%;
  height: 100%;
  overflow: visible;
  opacity: 1;
}

.menu-btn span {
  display: inline-block;
}

.nav-item:hover .menu-btn span {
  animation: spin 0.2s ease forwards;
}

@keyframes spin {
  0% {
    transform: rotate(315deg);
  }

  100% {
    transform: rotate(405deg);
  }
}

.menu-content {
  width: 0;
  height: 0;
  overflow: hidden;
  position: absolute;
  left: 0;
  z-index: 99;
  opacity: 0;
  transition: opacity 0.5s linear; /* drop down menu */
}

.menu-content a {
  display: block;
  color: var(--navy); /* drop down */
  background-color: var(--lightbl);
  padding: 12.5px 0;
  text-decoration: none;
  font-size: 20px;
  font-weight: bold;
  transition: all 0.5s linear;
  /* drop down menu colour transition */
}

.menu-content a:hover {
  color: var(--lightbl);
  background-color: var(--navy);
  text-transform: uppercase;
}