diff --git a/assets/css/src/components-plugin/_modal.scss b/assets/css/src/components-plugin/_modal.scss
index f76312c47b..8b017566a4 100644
--- a/assets/css/src/components-plugin/_modal.scss
+++ b/assets/css/src/components-plugin/_modal.scss
@@ -22,6 +22,7 @@
 .mailpoet-modal-frame {
   background: white;
   border: $modal-border-width solid $modal-light-gray-500;
+  border-radius: 4px;
   box-shadow: $modal-shadow-modal;
   box-sizing: border-box;
   height: 100%;