diff --git a/web/assets/css/custom.css b/web/assets/css/custom.css
index 279b57bf..f4cdd5de 100644
--- a/web/assets/css/custom.css
+++ b/web/assets/css/custom.css
@@ -1116,6 +1116,8 @@ li.ant-select-dropdown-menu-item:empty:after {
 }
 
 .qr-bg {
+    width: 100%;
+    height: 100%;
     background-color: #fff;
     display: flex;
     justify-content: center;