Flask-Bootstrap navbar not functioning properly - flask

Question

So, here is what I have in my app.py file:
from flask import Flask, render_template
from flask_bootstrap import Bootstrap
app = Flask( __name__)
Bootstrap(app)
#app.route('/')
def hello():
return render_template('index.html')
if __name__ == '__main__':
app.run(debug=True)
Here is what I have in my index.html file:
{% extends "bootstrap/base.html" %}
{% block navbar %}
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
{% endblock %}
{% block content %}
{% endblock %}
First picture is what I expect to see, second picture is what I actually get. I've cleared all cache on my browsers, tried Google Chrome and Mozilla Firefox. Please advise.

Answer 1

Flask boostrap is dead i think the last commit was made over 3 years ago...
https://getbootstrap.com/docs/4.3/getting-started/introduction/
Use that starter template as your base.html and add the navbar there.