ul,
li {
  margin: 0;
}

.dropdown {
  position: relative;
}

.dropdown-toggle {
  box-sizing: border-box;
  font-size: 16px;
  color: white;
  background: black;
  padding: 10px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

.dropdown-toggle:focus {
  outline: none;
}

.dropdown-list {
  box-sizing: border-box;
  list-style: none;
  width: calc(100% + 20px);
  position: absolute;
  margin-top: 5px;
  padding: 0;
  border: 1px solid #ccc;
  border-radius: 5px;
  overflow: hidden;
  animation: fadein 0.2s ease-in-out forwards;
  z-index: 100;
  background: #fff;
}

.dropdown-list-item {
  width: 100%;
  padding: 10px;
  opacity: 0;
  animation: fadein 0.25s 0.1s ease-in-out forwards;
}

.dropdown-list-item:hover {
  background: #eee;
}

.nav-button {
  background: none;
  color: #2979ff;
  padding: 0;
}

@keyframes fadein {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}