phosic-web/templates/form.html

{% macro forminput(field, helpblock='', placeholder='', class='') -%}
  <div class="form-group {% if field.errors|length > 0 %}has-error{% endif %}">
    <label for="mp3" class="col-sm-2 control-label">{{ field.label }}</label>
    <div class="col-sm-10">
      {% if placeholder %}
        {{ field(placeholder=placeholder, class=class) }}
      {% else %}
        {{ field(class=class) }}
      {% endif %}
      {% if field.errors %}
        {% for error in field.errors %}
          <span class="help-block">{{ error }}</span><br>
        {% endfor %}
      {% endif %}
      {% if helpblock %}
      <span class="help-block">{{ helpblock }}</span>
      {% endif %}
    </div>
  </div>
{%- endmacro %}

<form class="form-horizontal" role="form" enctype="multipart/form-data", method="post", action="{{ url_for('home') }}">

  {{ form.hidden_tag() }}
  {{ forminput(form.email, helpblock='We will send you download link here, nothing more.', placeholder='Please enter your email', class='form-control') }}
  {{ forminput(form.mp3) }}
  {{ forminput(form.pic) }}
  {{ forminput(form.recaptcha) }}

  <div class="form-group">
    <span class="col-sm-2">&nbsp</span>
    <div class="col-sm-10">
      <button type="submit" class="btn btn-default">Submit</button>
    </div>
  </div>
</form>