input {
    width: 2em;
    text-align: center;
    font-size: 1.5rem;
  }
  input::placeholder {
    color: #999;
  }
  @keyframes pulseError {
    0%, 100% { background-color: transparent; box-shadow: none; }
    50% { background-color: #f88; box-shadow: 0 0 0.3em #c00; }
  }
  @keyframes pulseSuccess {
    0%, 100% { background-color: transparent; box-shadow: none; }
    50% { background-color: #8f8; box-shadow: 0 0 0.3em #080; }
  }
  .pulse-error {
    animation: pulseError 0.4s ease 2;
  }
  .pulse-success {
    animation: pulseSuccess 0.4s ease 2;
  }
  .error {
    background-color: #fcc !important;
  }
  #shortcode-input label {
    display: none;
  }