style.css

list-box {
  position: relative;
}

list-box,
list-box list,
list-box list-item,
list-box .input {
  display: flex;
  flex-direction: column;
}

list-box .input {
  flex-direction: row;
  padding-right: 2em;
  cursor: pointer;
  color: #666;
}

list-box .input:focus ~ .listbox-icon {
  opacity: 1;
}

list-box .listbox-icon,
list-box .is-toggle-listbox {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  cursor: pointer;
}

list-box .listbox-icon {
  left: 0.3rem;
  opacity: 0.7;
  transition: all .2s ease;
}

list-box .is-toggle-listbox {
  right: 0.3rem;
  font-size: 1.5rem;
}

list-box list {
  position: absolute;
  top: 100%;
  width: 100%;
  max-height: 0;
  background-color: #fff;
  z-index: 10;
  box-shadow: 0 2px 10px -2px rgba(0, 0, 0, 0.1);
  font-size: 0.8rem;
  overflow: hidden;
  transition: max-height .2s ease;
}

list-box list.is-visible {
  max-height: 100vh;
}

list-box list-item {
  flex-direction: row;
  align-items: center;
  align-content: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  cursor: pointer;
}

list-box list-item:not(.is-active):hover {
  background-color: whitesmoke;
}

list-box list-item.is-active {
  background-color: #22adff;
  color: #fff;
}
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