Button is not vertically aligned when using Bootstrap

[nelsonlho]

I am using the following the code to create a form.
Without col-md-6, the button will be aligned on vertically. But with it, the button floats to the right.
Any idea to fix this?

{% load widget_tweaks %}
<form class="form" classaction="" method="post">{% csrf_token %}
        <div class="form-group col-md-6">
            <label for="title">Title</label>
            {%render_field form.title class="form-control" %}
        </div>

      <button type="submit" class="btn btn-success">Save</button>


</form>

[kmike]

Hey,

This looks like a markup problem, not an issue with django-widget-tweaks Python library.