diff --git a/web/data/editor.html b/web/data/editor.html
index efab6cc..9966bb6 100644
--- a/web/data/editor.html
+++ b/web/data/editor.html
@@ -175,8 +175,8 @@ function editor() {
 }
 
 function scalefactor(width, height) {
-  max_width = 800;
-  max_height = 600;
+  max_width = window.innerWidth * 3/5;
+  max_height = window.innerHeight * 5/6;
 
   if (width <= max_width && height <= max_height) {
     return 1.0;
@@ -187,7 +187,7 @@ function scalefactor(width, height) {
     return factor;
   }
 
-  return height/max_height;
+  return 1/ (height/max_height);
 }
   
 </script>