Fieldset

What is your address?

HTML

<fieldset class="govuk-fieldset lbh-fieldset">
  <legend class="govuk-fieldset__legend">What is your address?</legend>
</fieldset>

Fieldset as page heading

HTML

<fieldset class="govuk-fieldset lbh-fieldset">
  <legend class="govuk-fieldset__legend govuk-fieldset__legend--xl">
    <h1 class="govuk-fieldset__heading">What is your address?</h1>
  </legend>
</fieldset>