{% extends "layout.html" %}
{% block app_content %}
<div>
{% from "_formhelpers.html" import render_field %}
<form method="post" enctype="multipart/form-data">
<div class = "container">
<div class = "row">
<div class="col-md-5 col-sm-12 align-self-center">
<div class="card">
<div class="card-header">
Register
</div>
<div class="card-body">
<div>
{{ form.hidden_tag()}}
{{ render_field(form.fname, class="form-control")}}
{{ render_field(form.lname, class="form-control")}}
{{ render_field(form.email, class="form-control")}}
{{ render_field(form.phoneno, class="form-control")}}
{{ render_field(form.password, class="form-control")}}
{{ render_field(form.confirm_password, class="form-control")}}
{{ render_field(form.submit, class="btn btn-primary")}}
</div>
<p>Already have an account? <a href="{{ url_for('auth.login')}}">Login</a></p>
</div>
</div>
</div>
</div>
</div>
</form>
</div>
{% endblock app_content%}
This is my custom HTML code and I am trying to achieve placing an image as the background of the form. The goal is for the form to be displayed on top of this full-screen image. How can I accomplish this without using an external .css file?