diff --git a/fhem/www/codemirror/fhem_codemirror.js b/fhem/www/codemirror/fhem_codemirror.js
index b16e1fb21..08d9ac86a 100644
--- a/fhem/www/codemirror/fhem_codemirror.js
+++ b/fhem/www/codemirror/fhem_codemirror.js
@@ -63,8 +63,7 @@ cm_wait()
   if(ltype) {
     $("head").append(
       '<style type="text/css">'+
-        '.CodeMirror {height: auto;}'+
-        '.CodeMirror-scroll {overflow-y: hidden; overflow-x: auto;}'+
+        '.CodeMirror {height: ' + (window.innerHeight - 150) + 'px;}'+
       '</style>');
   }