main.html

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>Index</title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/semantic-ui/2.2.13/semantic.min.css">
    <link rel="stylesheet" href="app/css/style.css">
</head>

<body>
    <div class="ui buttons">
        <button class="js-btn-link ui button" data-link="grabber">Grabber</button>
        <button class="js-btn-link ui button" data-link="select">Editor</button>
        <button class="js-btn-link ui button" data-link="creator">Creator</button>
    </div>

</body>
    <script src="main.js"></script>
</html>