checking templates

app.py

@@ -3,9 +3,13 @@
 app = Flask(__name__)
 
 @app.route("/")
-def hello_world():
+def index():
     return render_template("starter.html")
 
 
+@app.route("/loading")
+def loading():
+    return render_template("spinner.html")
+
 if "__main__" == __name__:
     app.run()

templates/spinner.html

@@ -0,0 +1,11 @@
+{% extends 'base.html' %}
+
+{% block content %}
+
+<div class="d-flex justify-content-center mt-5">
+  <div class="spinner-border" role="status">
+    <span class="visually-hidden">Loading...</span>
+  </div>
+</div>
+
+{% endblock %}