diff --git a/cs1811.css b/cs1811.css
index 05306eba968b006a5596a952e16ce3ee74d3c904..fcade79338f5c33ab982eba1b1765e45e552c46c 100644
--- a/cs1811.css
+++ b/cs1811.css
@@ -7,7 +7,7 @@
  */
 
 .step {
-    font-family: Sans;
+    font-family: sans-serif;
 }
 
 .step.concept {
diff --git a/templates/impress.cs/css/style.css b/templates/impress.cs/css/style.css
index 2c00ef0d0d6a585f09494e35e61e304831906fa7..8f37cbcab8f4c263465079f1396189cdddda0ccc 100644
--- a/templates/impress.cs/css/style.css
+++ b/templates/impress.cs/css/style.css
@@ -47,7 +47,7 @@ table {
 }
 
 body {
-    font-family: Sans;
+    font-family: sans-serif;
     min-height: 740px;
 }