.skill-effect-preview {
  display: block;
  width: 128px;
  height: 128px;
  margin-top: 10px;
  border-radius: 8px;
  background: var(--skill-effect) 0 0 / 768px 128px no-repeat;
  filter: drop-shadow(0 8px 12px rgba(0, 0, 0, .34));
  animation: skillEffectFrames .8s steps(5, end) infinite;
}

@keyframes skillEffectFrames {
  from { background-position: 0 0; }
  to { background-position: -640px 0; }
}

@media (max-width: 520px) {
  .skill-effect-preview {
    width: 128px;
    height: 128px;
    background-size: 768px 128px;
    animation-name: skillEffectFrames;
  }
}

@keyframes skillEffectFramesSmall {
  from { background-position: 0 0; }
  to { background-position: -520px 0; }
}