@layer utilities {
  .shake {
    animation: shake 400ms both;
  }

  @keyframes appear-then-fade {
    0%, 100% { opacity: 0; }
    5%, 60%  { opacity: 1; }
  }

  @keyframes shake {
    0%  { transform: translateX(-2rem); }
    25% { transform: translateX(2rem); }
    50% { transform: translateX(-1rem); }
    75% { transform: translateX(1rem); }
  }
}