Title, three cities, a button. HTML + CSS + JS.

Goal

A poster with a click that changes the title.

Paste into the HTML pane:

<h1 id="title">Kiosk poster</h1>
<ul>
  <li>Nairobi</li>
  <li>Mombasa</li>
  <li>Kisumu</li>
</ul>
<button id="btn" type="button">Open Nairobi</button>

Paste into the CSS pane:

body { font-family: sans-serif; max-width: 320px; }
h1 { color: #8a5a12; }
button { margin-top: 12px; }

Paste into the JS pane:

document.getElementById("btn").onclick = () => {
  document.getElementById("title").textContent = "Nairobi is open";
};