govuk-frontend/dist/govuk/components/textarea/template-with-optional-form-group-classes.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 extra-class">
  <label class="govuk-label" for="textarea-with-page-heading">
    Full address
  </label>
  <textarea class="govuk-textarea" id="textarea-with-page-heading" name="address" rows="5"></textarea>
</div>