cibernox/ember-power-select

@keyframes drop-fade-below {
  0%   {
    opacity: 0;
    transform: translateY(-20px);
  }
  100% {
    opacity: 1;
    transform: translateY(3px);
  }
}
@keyframes drop-fade-above {
  0%   {
    opacity: 0;
    transform: translateY(20px);
  }
  100% {
    opacity: 1;
    transform: translateY(-3px);
  }
}

.slide-fade {
  // When opening below the trigger
  &.ember-basic-dropdown-content--below.ember-basic-dropdown--transitioning-in {
    animation: drop-fade-below .15s;
  }
  &.ember-basic-dropdown-content--below.ember-basic-dropdown--transitioning-out {
    animation: drop-fade-below .15s reverse;
  }

  // When opening above the trigger
  &.ember-basic-dropdown-content--above.ember-basic-dropdown--transitioning-in {
    animation: drop-fade-above .15s;
  }
  &.ember-basic-dropdown-content--above.ember-basic-dropdown--transitioning-out {
    animation: drop-fade-above .15s reverse;
  }
}