chore: change dark background

Author: hywax

Diff for: assets/style/tailwind.css

@@ -11,7 +11,7 @@
 html.dark {
     --fg: 255 255 255;
     --fg-dimmed: 212 212 216;
-    --background: 6 6 6;
+    --background: 22 22 22;
 }
 
 html.deep {