src/index.html

<!doctype html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/normalize.css@8.0.1/normalize.css">
  <link rel="stylesheet" href="assets/style.css">
  <title>USSD FLOW MOCK</title>
</head>

<body>

  <div class="phoneFrame app" data-status="options">
    <div class="displayFrame">
      <div class="display">
        <div class="overlay">...</div>
        <div class="content">
        </div>
        <div class="actionsPad">
          <div data-action="back">Back</div>

          <div data-action="quit">Quit</div>
          <div data-action="answer">Answer</div>

          <div data-action="clear">Clear</div>
          <div data-action="send">Send</div>

          <div data-action="names">Names</div>
          <div data-action="menu">Menu</div>
        </div>
      </div>
    </div>
    <div class="btnSet navPad">
      <div class="keyboardCol">
        <div class="btn confirm" data-action="ok">—</div>
        <div class="btn">call</div>
      </div>
      <div class="keyboardCol">
        <div class="btn up" data-action="up">⌃</div>
        <div class="btn down" data-action="down">⌄</div>
      </div>
      <div class="keyboardCol">
        <div class="btn cancel" data-action="cancel">—</div>
        <div class="btn" data-action="end">end</div>
      </div>
    </div>
    <div class="btnSet numPad">
      <div class="keyboardCol">
        <div class="btn" data-action="1">1</div>
        <div class="btn" data-action="4">4</div>
        <div class="btn" data-action="7">7</div>
        <div class="btn" data-action="*">*</div>
      </div>
      <div class="keyboardCol">
        <div class="btn" data-action="2">2</div>
        <div class="btn" data-action="5">5</div>
        <div class="btn" data-action="8">8</div>
        <div class="btn" data-action="0">0</div>
      </div>
      <div class="keyboardCol">
        <div class="btn" data-action="3">3</div>
        <div class="btn" data-action="6">6</div>
        <div class="btn" data-action="9">9</div>
        <div class="btn" data-action="#">#</div>
      </div>
    </div>
  </div>
  <script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"
    integrity="sha256-4+XzXVhsDmqanXGHaHvgh1gMQKX40OUvDEBTu8JcmNs=" crossorigin="anonymous"></script>

  <script src="assets/index.js"></script>

  <!-- REPLACE THE SAMPLE FLOW FILE WITH YOURS-->
  <script src="assets/sample_flow.js"></script>
</body>

</html>