diff --git a/2019/Joca_van_der_Horst/style.css b/2019/Joca_van_der_Horst/style.css
index e1bbcf6..472e7cb 100644
--- a/2019/Joca_van_der_Horst/style.css
+++ b/2019/Joca_van_der_Horst/style.css
@@ -27,8 +27,7 @@
   
   .chat {
     width: 100%;
-    height: 100%;
-    max-height: calc(100%-2.5rem);
+    height: calC(100% - 3rem);
     position: fixed;
     left: 0;
     top: 0;