diff --git a/public/css/main.less b/public/css/main.less
index 73bbb1f589..68ffd44dc0 100644
--- a/public/css/main.less
+++ b/public/css/main.less
@@ -735,6 +735,7 @@ form.code span {
 
 #mainEditorPanel {
   height: 100%;
+  width: 99%;
 }
 
 .big-error-icon {