<!DOCTYPE html>
<html ng-app="app" ng-strict-di>

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Stella Bot</title>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.7/angular.js"></script>
    <script src="./bundle.js"></script>
</head>

<body ng-controller="ChatBoxController as chatBox">
    <h1 class="title">Stella Onboarding Bot</h1>
    <chat-box class="chat-box" />
</body>

</html>

<!DOCTYPE html>
<html ng-app="app" ng-strict-di>

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Stella Bot</title>
    <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.7/angular.min.js"></script>
    <script src="./bundle.js"></script>
</head>

<body ng-controller="ChatBoxController as chatBox">
    <h1 class="title">Stella Onboarding Bot</h1>
    <chat-box class="chat-box" />
</body>

</html>

Change CDN to minified angular
Change CDN to minified angular
