diff --git a/_quarto.yml b/_quarto.yml
index 8b4575e..32d71b0 100644
--- a/_quarto.yml
+++ b/_quarto.yml
@@ -26,7 +26,9 @@ website:
 
 format:
   html:
-    theme: cosmo
+    theme:
+      light: cosmo
+      dark: darkly
     css: styles.css
     toc: false