{% import "forms.html" as forms %}
<div class="uniForm">
<form action="{{ url_for('add_bill', project_id=project.id) }}" method="post" class=uniForm">
    {{ form.hidden_tag() }} 
    {{ forms.input(form.what) }} 
    {{ forms.input(form.payer) }} 
    {{ forms.input(form.amount) }} 
    {{ forms.input(form.payed_for, multiple=True) }} 
    <p>{{ form.submit }}</p>
</form>
</div>