JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://stackpath.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<!-- ボタン -->
<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#favorite-user">
    お気に入りユーザー
</button>

<!-- モーダルダイアログ -->
<div class="modal fade" id="favorite-user" role="dialog" >
    <div class="modal-dialog" role="document">
        <div class="modal-content">
            <div class="modal-header">
                <h5 class="modal-title" id="demoModalTitle">タイトル</h5>
                <button type="button" class="close" data-dismiss="modal" aria-label="Close">
                    <span aria-hidden="true">&times;</span>
                </button>
            </div>
            <div class="modal-body">
                内容・・・
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-secondary" data-dismiss="modal">閉じる</button>
                <button type="button" class="btn btn-primary">ボタン</button>
            </div>
        </div>
    </div>
</div>