Untitled

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

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Currency Exchanger</title>
  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css"
    integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">
  <link rel="stylesheet" href="style.css">
</head>

<body>

  <body>
    <div class="container">
      <div class="input-group mb-3">
        <div class="input-group-prepend">
          <label class="input-group-text" for="inputGroupSelect01">從</label>
        </div>
        <select class="custom-select" id="inputGroupSelect01">
          <option value="CNY">人民幣(CNY)</option>
          <option value="JPY">日幣(JPY)</option>
          <option value="USD" selected>美元(USD)</option>
        </select>
      </div>
      <div class="input-group mb-3">
        <input type="text" id='start' placeholder='請輸入金額' class='text-center'>
      </div>

      <div class="input-group mb-3">
        <div class="input-group-prepend">
          <label class="input-group-text" for="inputGroupSelect01">轉為</label>
        </div>
        <select class="custom-select" id="inputGroupSelect03" aria-label="Example select with button addon">
          <option value="USD" selected>美元(USD)</option>
          <option value="CNY">人民幣(CNY)</option>
          <option value="JPY">日幣(JPY)</option>
        </select>
      </div>
      <div class="result text-center">
        <button class="exchange m-2">轉換!</button>
        <div class="panel-body">這裡將會顯示結果</div>
      </div>
    </div>
    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"
      integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"
      crossorigin="anonymous"></script>
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      crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js"
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      crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/axios/0.18.0/axios.min.js"></script>
    <script src="main.js"></script>
  </body>

</body>

</html>