diff --git a/src/demo/main.css b/src/demo/main.css
index 7d61667..477c3c8 100644
--- a/src/demo/main.css
+++ b/src/demo/main.css
@@ -629,6 +629,8 @@ html {
   box-shadow: 0px 4px 30px rgba(22, 33, 74, 0.05);
 }
 .selectedblock {
+  margin-top: -1px !important;
+  margin-left: -1px;
   border: 2px solid #217ce8;
   box-shadow: 0px 4px 30px rgba(22, 33, 74, 0.08);
 }