diff --git a/docs/stylesheets/extra.css b/docs/stylesheets/extra.css
index c9c7c02..03edcb5 100644
--- a/docs/stylesheets/extra.css
+++ b/docs/stylesheets/extra.css
@@ -12,6 +12,8 @@
 }
 
 [data-md-color-scheme="slate"] {
+  --md-hue: 232;
+  --md-default-bg-color: hsla(var(--md-hue), 15%, 21%, 1);
   --md-default-fg-color: hsla(var(--md-hue), 15%, 90%, 1);
   --md-default-fg-color--light: hsla(134.3, 0%, 99.5%, 0.61);
   --md-default-fg-color--lightest: hsla(232, 0%, 100%, 0.92);