input.date-auto-format {
      direction: ltr;
      text-align: left;
      font-size: 1.2em;
      padding: 5px;
      width: 150px;
      margin: 10px;
      border: 2px solid #ccc;
      outline: none;
      transition: border 0.2s;
    }
    input.date-auto-format.invalid {
      border: 2px solid red;
      background: #ffeaea;
    }
    .date-error {
      color: red;
      font-size: 0.9em;
      margin-top: -8px;
      margin-bottom: 8px;
      display: none;
    }
    .date-error.active {
      display: block;
    }