added 404 handling

app.py

@@ -33,4 +33,8 @@ def remove():
 			file.truncate()
 		except ValueError: # Don't crash trying to delete already deleted thing
 			pass
+	return redirect(url_for('index'))
+
+@app.errorhandler(404)
+def page_not_found(error):
 	return redirect(url_for('index'))

templates/base.html

@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+	<head>
+		<title>Shopping List</title>
+		<meta charset="UTF-8">
+		<meta name="viewport" content="width=device-width, initial-scale=1">
+
+		<link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='style.css') }}">
+		<link rel="shortcut icon" type="image/ico" href="{{ url_for('static', filename='icon.ico') }}">
+
+		<script>0</script>
+	</head>
+	<body>
+		{% block content %}{% endblock %}
+	</body>
+</html>

templates/index.html

@@ -1,16 +1,6 @@
-<!DOCTYPE html>
-<html>
-	<head>
-		<title>Shopping List</title>
-		<meta charset="UTF-8">
-		<meta name="viewport" content="width=device-width, initial-scale=1">
+{% extends 'base.html' %}
 
-		<link rel="stylesheet" type="text/css" href="{{ url_for('static', filename='style.css') }}">
-		<link rel="shortcut icon" type="image/ico" href="{{ url_for('static', filename='icon.ico') }}">
-
-		<script>0</script>
-	</head>
-	<body>
+{% block content -%}
 		<h1>
 			Shopping List
 		</h1>
@@ -29,5 +19,4 @@
 			<button><span>+</span></button>
             <input type="text" name="item" autocomplete="off" autofocus>
         </form>
-	</body>
-</html>
+{%- endblock %}