verification-code-fieldset.html

<fieldset>
  <legend>2. Enter your 6-digit code:</legend>
  <div class="verify-btn-wrapper">
    <input type="text"
           pattern="\d*"
           name="code"
           size="6"
           autocomplete="off"
           aria-label="verification code"
           aria-required="true">
    <button type="submit" name="verify"> Verify </button>
    <span class="validation big ss-standard"></span>
    <span class="screen-reader-text" aria-live="polite"></span>
  </div>
</fieldset>