diff --git a/css/80_app.css b/css/80_app.css
index 6c21369..143ec56 100644
--- a/css/80_app.css
+++ b/css/80_app.css
@@ -3,7 +3,7 @@
 /* the root element of iD */
 .ideditor {
     height: 100%;
-    width: 100%;
+    width: 80%;
     margin: 0;
     padding: 0;
     border: 0;