Changed 404 message

src/main/resources/public/404.html

@@ -8,7 +8,9 @@
 
 <body style="text-align: center;">
     <h1>Error 404!</h1>
-    It's okay, we all make mistakes.
+    <p>Looks like the link you entered isn't valid.</p>
+    <p>It's okay, though.</p>
+    <p>All of us make mistakes!</p>
 </body>
 
 </html>