Update app.py

app.py

@@ -593,6 +593,21 @@ def frontpage():
 def home():
     return render_template('home.html')
 
+@app.route("/about")
+def about():
+    return render_template("about.html", active_page="about")
+
+
+@app.route("/privacy")
+def privacy():
+    return render_template("privacy.html", active_page="privacy")
+
+
+@app.route("/contact")
+def contact():
+    return render_template("contact.html", active_page="contact")
+
+
 @app.route('/Optimization')  
 def Optimization():
     return render_template('Optimization.html', active_page='Optimization')