diff --git a/app/less/app.less b/app/less/app.less
index cdd06ef6..388b3fc4 100644
--- a/app/less/app.less
+++ b/app/less/app.less
@@ -4092,6 +4092,8 @@ ul.chat_modal_migrate_list {
 }
 
 .modal-dialog {
+  width: 100%;
+  
   .md_simple_modal_window &,
   .confirm_modal_window &,
   .error_modal_window & {