diff --git a/_layouts/default.html b/_layouts/default.html
index bf1309e..4faa562 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -4,7 +4,7 @@
 <head>
     <meta charset="UTF-8">
     <title>{{ page.title | default: site.title }}</title>
-    <link rel="stylesheet" type="text/css" href="https://www.uni-bremen.de/typo3temp/assets/compressed/merged-eae16551655b6f6d9bb6ce5075a0ec7b-min.css.gzip?1743500704" media="all">
+    <link rel="stylesheet" type="text/css" href="https://onlinetools.zfn.uni-bremen.de/server/inc/proto.css" media="all">
     <script type="text/javascript" id="MathJax-script" async
         src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-chtml.js">
         </script>
