Khmer Web: Base Template & Child Template

<!--templates/base.html-->
<!DOCTYPE html>
<html>
  <head>
    {% block head %}
    <meta charset="UTF-8"/>
    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
    <title>{{data['blog_title']}}</title>
    <script src="/static/scripts/jQuery.js"></script>
    <script src='/static/scripts/main.js'></script>
    <link href="/static/styles/index.css" rel="stylesheet">
    <link href="/static/fonts/setup.css" rel='stylesheet'>
    <link href="/static/images/site_logo.png" rel="icon">
    {% endblock %}
  </head>
  <body>
    <div id="main">
      {% block main %}
      <div id="content">{% block content %}{% endblock %}</div>
      <div id="sidebar">{% block sidebar %}{% endblock %}</div>
      {% endblock %}
    </div>

    <div id="footer">
      {% block footer %}
      &copy; Copyright 2020 by <a href="https://www.khmerweb.app/">Khmer Web</a>.
      {% endblock %}
    </div>
  </body>
</html>


{% extends "base.html" %}
{% block content %}
Hello World!
{% endblock %}

GitHub: "https://github.com/Sokhavuth/E-Learning
Heroku: https://khmerweb-elearning.herokuapp.com/