Split app.js in to smaller chunks

public/css/style.css

@@ -0,0 +1,62 @@
+body {
+    font-family: Arial, sans-serif;
+}
+
+.container {
+    width: 300px;
+    padding: 20px;
+    background-color: #fff;
+    border-radius: 8px;
+    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
+}
+
+h1 {
+    text-align: center;
+}
+
+#responseMessage {
+    text-align: center;
+    color: green;}
+
+.menu {
+    position: relative;
+    display: inline-block;
+}
+
+.hamburger {
+    font-size: 24px;
+    cursor: pointer;
+    background: none;
+    border: none;
+}
+
+.menu-content {
+    display: none;
+    position: absolute;
+    background-color: #f9f9f9;
+    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
+    z-index: 1;
+}
+
+.menu-content button {
+    color: black;
+    padding: 12px 16px;
+    text-decoration: none;
+    display: block;
+    background: none;
+    border: none;
+    width: 100%;
+    text-align: left;
+}
+
+.menu-content button:hover {
+    background-color: #f1f1f1;
+}
+
+.menu.show .menu-content {
+    display: block;
+}
+
+nav, .sidenav {
+    display: none;
+}