diff --git a/test/mix-dark-theme.html b/test/mix-dark-theme.html
index 4fd4ab0d6..71cdf0823 100644
--- a/test/mix-dark-theme.html
+++ b/test/mix-dark-theme.html
@@ -117,6 +117,7 @@
         A --> C(Round Rect)
         B    ==  testing ==>     D{Rhombus}
         C-.->D
+
     </div>
     <hr/>
     <div class="mermaid">