diff --git a/darklight.js b/darklight.js
new file mode 100644
index 00000000..ab713444
--- /dev/null
+++ b/darklight.js
@@ -0,0 +1,7 @@
+toggle_switch = document.querySelector('#dark-mode');
+
+toggle_switch.addEventListener 'input', ->
+  label = @labels[0];
+  body = document.body;
+  
+  body.dataset.darkMode = label.dataset.darkMode = @checked;