index.html

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

<head>
  <meta charset="UTF-8" />
  <link rel="shortcut icon" href="/favicon.ico" type="image/x-icon" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Vue with Apollo</title>

  <!-- CSS only -->
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.0/dist/css/bootstrap.min.css" rel="stylesheet"
    integrity="sha384-KyZXEAg3QhqLMpG8r+8fhAXLRk2vvoC2f3B09zVXn8CA5QIVfZOJ3BCsw2P0p/We" crossorigin="anonymous">

  <!-- JavaScript Bundle with Popper -->
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.0/dist/js/bootstrap.bundle.min.js"
    integrity="sha384-U1DAWAznBHeqEIlVSCgzq+c9gqGAJn5c/t99JyeKa9xxaYpSvHU5awsuZVVFIhvj"
    crossorigin="anonymous"></script>
</head>

<body>
  <div id="app"></div>
  <script type="module" src="/src/main.js"></script>
</body>

</html>