website/app/modules/backend/modules/file/templates/create.j2

{% extends "layout/backend.j2" %}
{% block content %}
<h1>Page create</h1>
<form method="post">
    <div class="form-group">
        <label class="text-normal text-dark">title</label>
        <input type="text" class="form-control" name="title" placeholder="title">
    </div>
    <div class="form-group">
        <label class="text-normal text-dark">Source</label>
        <textarea class="form-control" name="source"></textarea>
    </div>
    <div class="form-group">
        <label class="text-normal text-dark">Parent</label>
        <select class="form-control" name="parent_id">
            <option></option>
            {% for page in pages %}
            <option value="{{ page.id }}">{{ page.title }}</option>
            {% endfor %}
        </select>
    </div>
    <div class="form-group pull-right">
        <button class="btn btn-primary">Create</button>
    </div>
</form>
{% endblock %}