added exo-4

exo-004/index.html

@@ -0,0 +1,31 @@
+<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport"
+          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
+    <meta http-equiv="X-UA-Compatible" content="ie=edge">
+    <title>Document</title>
+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bulma@0.9.4/css/bulma.min.css">
+    <script type="module" src="index.js"></script>
+</head>
+<body>
+<div>
+    <input type="text" id="input-1" />
+    <div>
+        <button id="button-1">button-1</button>
+    </div>
+    <div>
+        <button id="button-2">button-2</button>
+    </div>
+    <div>
+        <button id="button-3">button-3</button>
+    </div>
+    <div>
+        <button id="button-4">button-4</button>
+    </div>
+
+    <pre id="output-1"></pre>
+</div>
+</body>
+</html>