diff --git a/doc.zih.tu-dresden.de/tud_theme/404.html b/doc.zih.tu-dresden.de/tud_theme/404.html
index dbf2e938ee4adb89820c8566070904c24c9e3ad9..11088f9b77a12b7959ecd679aa28ce7f8a718016 100644
--- a/doc.zih.tu-dresden.de/tud_theme/404.html
+++ b/doc.zih.tu-dresden.de/tud_theme/404.html
@@ -2,6 +2,8 @@
 
 {% block content %}
 
+<center><img src="/assets/images/sad_smiley.png" alt="Sad smiley - page not found" width="200" height="200"/></center>
+
 <h3 style="text-align:center">The page you requested could not be found.</h3>
 <h3 style="text-align:center">Probably it has been moved, please use the search bar.</h3>
 
diff --git a/doc.zih.tu-dresden.de/tud_theme/assets/images/sad_smiley.png b/doc.zih.tu-dresden.de/tud_theme/assets/images/sad_smiley.png
new file mode 100644
index 0000000000000000000000000000000000000000..bbd5d3a73bdbecdaf095cf435a1af51086e50880
Binary files /dev/null and b/doc.zih.tu-dresden.de/tud_theme/assets/images/sad_smiley.png differ