some structure

app.py

@@ -20,6 +20,10 @@ js.build()
 
 @app.route("/")
 def homepage():
+    return render_template("main-page.html")
+
+@app.route("/todo")
+def page_todo():
     return render_template("page1.html")
 
  

templates/main-page.html

@@ -0,0 +1,9 @@
+{% extends "base.html" %}
+
+{% block content %} 
+
+<div class="content">
+    sup
+</div>
+
+{% endblock content %}