cs50/project/templates/index.html

{% extends "layout.html" %}

{% block title %}
Index
{% endblock %}

{% block main %}
<div class="header">
    <h1>Hallo {{ user.username }}!</h1>
    <div class="container-fluid">
        <div class="section">
            
        </div>
    </div>
</div>
{% endblock %}