govuk-frontend/dist/govuk/components/radios/template-small.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-radios--small">
  <fieldset class="govuk-fieldset">
    <legend class="govuk-fieldset__legend">
      How do you want to be contacted?
    </legend>
    <div class="govuk-radios" data-module="govuk-radios">
      <div class="govuk-radios__item">
        <input class="govuk-radios__input" id="how-contacted-2" name="how-contacted-2" type="radio" value="email">
        <label class="govuk-label govuk-radios__label" for="how-contacted-2">
          Email
        </label>
      </div>
      <div class="govuk-radios__item">
        <input class="govuk-radios__input" id="how-contacted-2-2" name="how-contacted-2" type="radio" value="phone">
        <label class="govuk-label govuk-radios__label" for="how-contacted-2-2">
          Phone
        </label>
      </div>
      <div class="govuk-radios__item">
        <input class="govuk-radios__input" id="how-contacted-2-3" name="how-contacted-2" type="radio" value="text">
        <label class="govuk-label govuk-radios__label" for="how-contacted-2-3">
          Text message
        </label>
      </div>
    </div>
  </fieldset>
</div>