doc: make legacy banner slightly less bright

Trott · juanarbol · commit 3e38ba53cced · 2022-10-11T14:45:26.000-05:00
PR-URL: #44665 Reviewed-By: Beth Griggs <bethanyngriggs@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Tobias Nießen <tniessen@tnie.de>
diff --git a/doc/api_assets/style.css b/doc/api_assets/style.css
@@ -4,7 +4,7 @@
   --black1: #090c15;
   --black2: #2c3437;
   --black3: #0d111d;
-  --blue1: #00f;
+  --blue1: #0a56b2;
   --white: #ffffff;
   --white-smoke: #f2f2f2;
   --grey-smoke: #e9edf0;
