diff --git a/docs/_static/css/my_theme.css b/docs/_static/css/my_theme.css
index a587f866d..d078ec057 100644
--- a/docs/_static/css/my_theme.css
+++ b/docs/_static/css/my_theme.css
@@ -27,3 +27,9 @@ pre {
     white-space: pre-wrap !important;
     word-break: break-all;
 }
+
+[data-theme="dark"] .mermaid {
+    background-color: #f4f4f6 !important;
+    border-radius: 6px;
+    padding: 0.5em;
+  }