govuk-frontend/dist/govuk/components/input/template-with-label-as-page-heading.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">
  <h1 class="govuk-label-wrapper">
    <label class="govuk-label govuk-label--l" for="input-with-page-heading">
      National Insurance number
    </label>
  </h1>
  <input class="govuk-input" id="input-with-page-heading" name="test-name" type="text">
</div>