diff --git a/web/app.js b/web/app.js
new file mode 100644
index 0000000..b4debf6
--- /dev/null
+++ b/web/app.js
@@ -0,0 +1,5 @@
+const $connectButton = document.getElementById('MCU_connect');
+
+console.log($connectButton);
+
+// ...
diff --git a/web/index.html b/web/index.html
new file mode 100644
index 0000000..772b38e
--- /dev/null
+++ b/web/index.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Document</title>
+    <script defer src="./app.js"></script>
+  </head>
+  <body>
+    <button id="MCU_connect">Connect</button>
+  </body>
+</html>