{{ define "captcha" }}
  <div class="captcha-container text-center">
    <img src="/captcha/{{ . }}" alt="Captcha">
  </div>
  <input class="form-control" type="hidden" name="captchaId" value="{{ . }}">
  <input class="form-control" id="postCaptcha" type="tel" pattern="\d+" placeholder="Captcha" name="captcha">
{{ end }}