diff --git a/docs/assets/css/extra.css b/docs/assets/css/extra.css
index 660468f02..b1c6643e6 100644
--- a/docs/assets/css/extra.css
+++ b/docs/assets/css/extra.css
@@ -9,6 +9,10 @@
     display: table;
 }
 
+/* Dark mode */
+[data-md-color-scheme="slate"] {
+    --md-default-bg-color: black;
+  }
 /* 
 :root {
     --md-primary-fg-color:        #EE0F0F;