tu-view-plus/lib/src/select-view/style/select-view.css

.tu-select-view:hover .tu-select-view__icon--clear {
  display: block;
}
.tu-select-view:hover .tu-select-view__icon--clear:hover {
  color: var(--tu-color-text, #71757f);
}

.tu-select-view:hover .tu-select-view__icon ~ * {
  display: none;
}

.tu-select-view--single {
  cursor: pointer;
}

.tu-select-view__icon {
  position: relative;
  color: var(--tu-color-text-placeholder, #9b9fa8);
  transition: transform var(--tu-transition-duration-2, 0.2s);
}
.tu-select-view__icon--clear {
  display: none;
  cursor: pointer;
  transition: color var(--tu-transition-duration-3, 0.3s);
}

.tu-select-view.is-opened .tu-select-view__icon--arrow {
  transform: rotateZ(-180deg);
}