Form render with widget_tweaks and required fields

required_fields.html

<!-- https://djangosnippets.org/snippets/474/ -->

{% load widget_tweaks %}

<style>
  span.required:after {
    content: "*";
    color: red;
  }
</style>

{% for field in form.visible_fields %}
  <div class="form-group{% if field.errors %} has-error {% endif %}">
    <label for="{{ field.id_for_label }}">
      {% if field.field.required %}
        <span class="required">{{ field.label }} </span>
      {% else %}
        {{ field.label }}
      {% endif %}
    </label>
    {% render_field field class="form-control" %}
    {% for error in field.errors %}
      <span class="text-muted">{{ error }}</span>
    {% endfor %}
  </div>
{% endfor %}

label.required:after {
      content: '*';
      color: red;
    }