django-crispy-forms bootstrap 4:如何水平显示复选框？

from crispy_forms.helper import FormHelper
from crispy_forms.layout import Layout, Div, Field

class MyForm(forms.Form):
    my_checkbox = forms.BooleanField()

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.helper = FormHelper()
        self.helper.layout = Layout(
            Div(
                Field('my_checkbox', css_class='form-check-inline'),
                css_class='form-check'
            )
        )

{% load crispy_forms_tags %}

<form method="post">
  {% csrf_token %}
  {{ form|crispy }}
  <button type="submit">Submit</button>
</form>