{% load bootstrap_toolkit %}

<form action="/url/to/submit/" method="post">
    {% csrf_token %}
    {{ form|as_bootstrap }}
    <div class="actions">
        <button type="submit" class="btn primary">Submit</button>
    </div>
</form>

from bootstrap.forms import BootstrapForm, Fieldset

class LoginForm(BootstrapForm):
    class Meta:
        layout = (
            Fieldset("Please Login", "username", "password", ),
        )

    username = forms.CharField(max_length=100)
    password = forms.CharField(widget=forms.PasswordInput(), max_length=100)