diff --git a/doc/fmt.css b/doc/fmt.css
index 3ad561d6..3cd92f9b 100644
--- a/doc/fmt.css
+++ b/doc/fmt.css
@@ -1,3 +1,7 @@
+:root {
+  --md-primary-fg-color: #0065C9;
+}
+
 .md-grid {
   max-width: 960px;
 }