govuk-frontend/dist/govuk/components/textarea/template-with-error-message.html

GOV.UK Frontend contains the code you need to start building a user interface for government platforms and services.

<div class="govuk-form-group govuk-form-group--error">
  <label class="govuk-label" for="no-ni-reason">
    Why can’t you provide a National Insurance number?
  </label>
  <p id="no-ni-reason-error" class="govuk-error-message">
    <span class="govuk-visually-hidden">Error:</span> You must provide an explanation
  </p>
  <textarea class="govuk-textarea govuk-textarea--error" id="no-ni-reason" name="no-ni-reason" rows="5" aria-describedby="no-ni-reason-error"></textarea>
</div>