diff --git a/web/templates/base.html b/web/templates/base.html
index 4daa42f..dcd9bc1 100644
--- a/web/templates/base.html
+++ b/web/templates/base.html
@@ -229,6 +229,13 @@
         window.addEventListener('blur', close);
       }
     })();
+
+      // Safe to include site-wide; it only adds a class.
+  (function(){
+    if (localStorage.getItem("darkMode") === "true") {
+      document.body.classList.add("dark-mode");
+    }
+  })();
   </script>
 </body>
 </html>
\ No newline at end of file