diff --git a/frontend/website.py b/frontend/website.py
index 713cac4..793ed52 100644
--- a/frontend/website.py
+++ b/frontend/website.py
@@ -8,6 +8,7 @@ import sendmail
 import pytoml as toml
 import jwt
 import pylibscrypt
+import smtplib
 
 
 class Datagetter(object):
@@ -87,7 +88,10 @@ def register():
 
     # send the mail
     m = sendmail.Mailer(config)
-    m.send("Complete your registration here: " + confirmlink, email, "[Ticketfrei] Confirm your account")
+    try:
+        m.send("Complete your registration here: " + confirmlink, email, "[Ticketfrei] Confirm your account")
+    except smtplib.SMTPRecipientsRefused:
+        return "Please enter a valid E-Mail address."
     return "We sent you an E-Mail. Please click on the confirmation link."
 
 
diff --git a/static/css/style.css b/static/css/style.css
index d448559..91be648 100644
--- a/static/css/style.css
+++ b/static/css/style.css
@@ -1,5 +1,5 @@
 body {
-  background-image: url(../img/wallpaper.png);
+  background-image: url(/static/img/wallpaper.png);
   font-family: Verdana, Arial, Helvetica, sans-serif;
   font-size: 15px;
   line-height: 1.5em;