Create web app blueprint with Flask

app/templates/base.html

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+{% extends 'bootstrap/base.html' %}
+
+{% block title %}
+{% if title %}{{ title }} - graphPaname{% else %}graphPaname{% endif %}
+{% endblock %}
+
+{% block styles %}
+<link rel="stylesheet"
+      href="{{url_for('.static', filename='bootstrap.min.css')}}">
+{% endblock %}
+
+{% block navbar %}
+<nav class="navbar navbar-expand-lg navbar-dark bg-primary">
+    <a class="navbar-brand" href="{{ url_for('index') }}">graphPaname</a>
+    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarColor01" aria-controls="navbarColor01" aria-expanded="false" aria-label="Toggle navigation">
+        <span class="navbar-toggler-icon"></span>
+    </button>
+
+    <div class="collapse navbar-collapse" id="navbarColor01">
+        <ul class="navbar-nav mr-auto">
+            <li class="nav-item active">
+                <a class="nav-link" href="{{ url_for('index') }}">Home <span class="sr-only">(current)</span></a>
+            </li>
+            <li class="nav-link"><a href="{{ url_for('data') }}">Data</a></li>
+        </ul>
+    </div>
+</nav>
+{% endblock %}
+
+{% block content %}
+<div class="container">
+    {% with messages = get_flashed_messages() %}
+    {% if messages %}
+    {% for message in messages %}
+    <div class="alert alert-info" role="alert">{{ message }}</div>
+    {% endfor %}
+    {% endif %}
+    {% endwith %}
+
+    {# application content needs to be provided in the app_content block #}
+    {% block app_content %}{% endblock %}
+</div>
+{% endblock %}