개별실습으로 navbar를 만들어보는데, css가 깨져서 나와요..

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개별실습으로 navbar를 만들어보는데, css가 깨져서 나와요..
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답변 완료
완강 후, 실습을 혼자 해보고 있는데 navbar를 부트스트랩에서 그대로 복사 붙여넣었는데 css가 깨져서 나옵니다.
navbar를 완성하려면 어떻게 해야하나요?
그리고 혹 저 제목 폰트를 더 크게 키울수 있는 방법은 뭘까요?
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width,initial-scale=1, shrink-to-fit=no">
    <meta property="og:site_name" content="Be Abstract">
    <meta property="og:description" content="More Creative, Value Creation">

    <title>Be Abstract</title>
    <script defer="defer" src="bundle.js"></script>
    <link href="https://fonts.googleapis.com/css2?family=East+Sea+Dokdo&family=Nanum+Brush+Script&display=swap" rel="stylesheet">

    <style>
        * {
            font-family: 'East Sea Dokdo', cursive;
            font-family: 'Nanum Brush Script', cursive;
        }
        .mynavbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            background-color: #263343;
            padding: 8px 12px;
        }

        .mypic {
            width: 100%;
            height: 250px;

            background-image: linear-gradient(0deg, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.3)), url('https://images.unsplash.com/photo-1558346648-9757f2fa4474?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1170&q=80');
            background-position: center;
            background-size: cover;

            color: white;

            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }
        .mypost {
            width: 95%;
            max-width: 500px;
            margin: 20px auto 20px auto;

            box-shadow: 0px 0px 3px 0px black;
            padding: 20px;
        }
        .mypost > button {
            margin-top: 15px;
        }
        .mycards {
            width: 95%;
            max-width: 500px;
            margin: auto;
        }
        .mycards > .card {
            margin-top: 10px;
            margin-bottom: 10px;
        }
    </style>
    <script>
        $(document).ready(function(){
            show_comment()
        });

        function save_comment(){
            let name = $('#name').val()
            let comment =$('#comment').val()
            $.ajax({
                type: 'POST',
                url: '/homework',
                data: {name_give: name, comment_give: comment},
                success: function (response) {
                    alert(response['msg'])
                    window.location.reload()
                }
            })
        }
        function show_comment(){
            $.ajax({
                type: "GET",
                url: "/homework",
                data: {},
                success: function (response) {
                    let rows = response['comments']
                    for (let i = 0; i <rows.length; i++) {
                        let name = rows[i]['name']
                        let comment = rows[i]['comment']

                        let temp_html = `<div class="card">
                                            <div class="card-body">
                                                <blockquote class="blockquote mb-0">
                                                    <p>${comment}</p>
                                                    <footer class="blockquote-footer">${name}</footer>
                                                </blockquote>
                                            </div>
                                        </div>`
                        $('#comment-list').append(temp_html)
                    }

                }
            });
        }
    </script>
</head>
<body>
    <div class = "mynavbar">
        <nav>
            <div class="container px-4 px-lg-5">
                <a class="navbar-brand" href="#!">Be Abstract</a>
                <button class="navbar-toggler" type="button" data-bs-toggle="collapse"
                        data-bs-target="#navbarSupportedContent"
                        aria-controls="navbarSupportedContent" aria-expanded="false"
                        aria-label="Toggle navigation"><span
                        class="navbar-toggler-icon"></span></button>
                <div class="collapse navbar-collapse" id="navbarSupportedContent">
                    <ul class="navbar-nav me-auto mb-2 mb-lg-0 ms-lg-4">
                        <li class="nav-item"><a class="nav-link active" aria-current="page" href="#!">Home</a></li>
                        <li class="nav-item"><a class="nav-link" href="#!">About</a></li>
                        <li class="nav-item dropdown">
                            <a class="nav-link dropdown-toggle" id="navbarDropdown" href="#" role="button"
                               data-bs-toggle="dropdown" aria-expanded="false">Market</a>
                            <ul class="dropdown-menu" aria-labelledby="navbarDropdown">
                                <li><a class="dropdown-item" href="#!">All Products</a></li>
                                <li>
                                    <hr class="dropdown-divider"/>
                                </li>
                                <li><a class="dropdown-item" href="#!">Popular Items</a></li>
                                <li><a class="dropdown-item" href="#!">New Arrivals</a></li>
                            </ul>
                        </li>
                    </ul>
                    <form class="d-flex">
                        <button class="btn btn-outline-dark" type="submit">
                            <i class="bi-cart-fill me-1"></i>
                            Cart
                            <span class="badge bg-dark text-white ms-1 rounded-pill">0</span>
                        </button>
                    </form>
                </div>
            </div>
        </nav>
    </div>

    <div class="mypic">
        <h1>Be Abstract</h1>
        <p>More Creative, Value Creation</p>
    </div>
    <div class="mypost">
        <div class="form-floating mb-3">
            <input type="text" class="form-control" id="name" placeholder="url">
            <label for="floatingInput">닉네임</label>
        </div>
        <div class="form-floating">
                <textarea class="form-control" placeholder="Leave a comment here" id="comment"
                          style="height: 100px"></textarea>
            <label for="floatingTextarea2">응원댓글</label>
        </div>
        <button onclick="save_comment()" type="button" class="btn btn-dark">응원 남기기</button>
    </div>
    <div class="mycards" id="comment-list">
    </div>
</body>
</html>
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