diff --git a/public/themes/vanilla/modules/postWindow.less b/public/themes/vanilla/modules/postWindow.less
index 5f97d9cbe7..54db9b44a1 100644
--- a/public/themes/vanilla/modules/postWindow.less
+++ b/public/themes/vanilla/modules/postWindow.less
@@ -10,6 +10,9 @@
 		height: 100%;
 		background: rgba(64, 64, 64, 0.6);
 		visibility: visible;
+		-webkit-border-radius: 10px;
+		-moz-border-radius: 10px;
+		border-radius: 10px;
 
 		.btn-toolbar {
 			&.formatting-bar {