/* ---------- Screen shake ---------- */
@keyframes screen-shake {
  0%,
  100% {
    transform: translate(0, 0);
  }
  20% {
    transform: translate(-6px, 4px);
  }
  40% {
    transform: translate(5px, -5px);
  }
  60% {
    transform: translate(-4px, -3px);
  }
  80% {
    transform: translate(3px, 5px);
  }
}
body.shake #app {
  animation: screen-shake 0.4s ease;
}