govuk-frontend/dist/govuk/components/textarea/template-default.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">
  <label class="govuk-label" for="more-detail">
    Can you provide more detail?
  </label>
  <textarea class="govuk-textarea" id="more-detail" name="more-detail" rows="5"></textarea>
</div>