diff --git a/index.html b/index.html
new file mode 100644
index 0000000..cbfff4c
--- /dev/null
+++ b/index.html
@@ -0,0 +1,31 @@
+<!doctype html>
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width,initial-scale=1">
+  <title>Welcome to the dark side</title>
+  <style>
+    body.light {
+      background-color: #fff;
+      color: #222;
+    }
+    body.dark {
+      background-color: #222;
+      color: #fff;
+    }
+
+    .dark-mode-toggle {
+      cursor: pointer;
+      padding: 1em;
+
+      /* hide toggle until we're sure user has JS enabled */
+      visibility: hidden;
+    }
+  </style>
+</head>
+<body class="light">
+  <h1>Welcome to the dark side</h1>
+  <button class="dark-mode-toggle">Click me!</button>
+
+  <script src="dark-mode.min.js"></script>
+</body>
+</html>
