1-17 듣는중인데 웹에서 반영이 안되요 ㅜ

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1-17 듣는중인데 웹에서 반영이 안되요 ㅜ
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답변 완료
<!doctype html>
<html lang="en">

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet"
          integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js"
            integrity="sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM"
            crossorigin="anonymous"></script>

    <title>스파르타코딩클럽 | 부트스트랩 연습하기</title>
    <link href="https://fonts.googleapis.com/css2?family=Gowun+Dodum&display=swap" rel="stylesheet">

</head>
<style>
    * {
        font-family: 'Gowun Dodum', sans-serif;
    }

    .mytitle {
        background-color: green;

        width: 100%;
        height: 250px;

        background-image: linear-gradient(0deg, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url("https://movie-phinf.pstatic.net/20210715_95/1626338192428gTnJl_JPEG/movie_image.jpg");
        background-position: center;
        background-size: cover;

        color: white;

        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
    }

    .mytitle > button {
        width: 200px;
        height: 50px;

        background-color: transparent;
        color: white;

        border-radius: 50px;

        border: 2px solid white;

        margin-top: 10px;
    }

    .mytitle > button:hover {
        border: 1px solid white;
    }

    .mycomment {
        color: gray;
    }

    .wrap {
        width: 1200px;
        margin: 20px auto 0px auto;
    }
    .mypost {
        max-width: 500px;
        width: 95%;

        margin: 20px auto 0px auto;

        box-shadow: 0px 0px 3px 3px;
        padding: 20px;
    }
    .mybtn {
          display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;

        margin-top: 10px;
    }
    .mybtn > button {
        margin-right: 10px;
    }
    </style>
    <script> {
        function sum(a,b){
            alert('계산을 하자')
            return a+b
        }
        let result = sum(2,3)
        alert(result)
    </script>

<body>
    <div class="mytitle">
        <h1>내 생애 최고의 영화들</h1>
        <button>영화 기록하기</button>
    </div>
    <div class="mypost">
        <div class="form-floating mb-3">
            <input type="email" class="form-control" id="floatingInput" placeholder="name@example.com">
            <label for="floatingInput">영화URL</label>
        </div>
        <div class="input-group mb-3">
            <label class="input-group-text" for="inputGroupSelect01">별점</label>
            <select class="form-select" id="inputGroupSelect01">
                <option selected>--선택하기--</option>
                <option value="1">*</option>
                <option value="2">**</option>
                <option value="3">***</option>
                <option value="4">****</option>
                <option value="5">*****</option>
            </select>
        </div>
        <div class="form-floating">
            <textarea class="form-control" placeholder="Leave a comment here" id="floatingTextarea"></textarea>
            <label for="floatingTextarea">코멘트</label>
        </div>
        <div class="mybtn"
           <button type="button" class="btn btn-dark">기록하기</button>
            <button type="button" class="btn btn-outline-dark">닫기</button>
        </div>
    </div>
    <div class="wrap">
        <div class="row row-cols-1 row-cols-md-4 g-4">
            <div class="col">
                <div class="card">
                    <img src="https://movie-phinf.pstatic.net/20210728_221/1627440327667GyoYj_JPEG/movie_image.jpg"
                         class="card-img-top" alt="...">
                    <div class="card-body">
                        <h5 class="card-title">여기에 제목이 들어갑니다</h5>
                        <p class="card-text">여기에 내용이 들어가지요</p>
                        <p>⭐⭐⭐</p>
                        <p class="mycomment">여기에 코멘트가 들어갑니다.</p>
                    </div>
                </div>
            </div>
            <div class="col">
                <div class="card">
                    <img src="https://movie-phinf.pstatic.net/20210728_221/1627440327667GyoYj_JPEG/movie_image.jpg"
                         class="card-img-top" alt="...">
                    <div class="card-body">
                        <h5 class="card-title">여기에 제목이 들어갑니다</h5>
                        <p class="card-text">여기에 내용이 들어가지요</p>
                        <p>⭐⭐⭐</p>
                        <p class="mycomment">여기에 코멘트가 들어갑니다.</p>
                    </div>
                </div>
            </div>
            <div class="col">
                <div class="card">
                    <img src="https://movie-phinf.pstatic.net/20210728_221/1627440327667GyoYj_JPEG/movie_image.jpg"
                         class="card-img-top" alt="...">
                    <div class="card-body">
                        <h5 class="card-title">여기에 제목이 들어갑니다</h5>
                        <p class="card-text">여기에 내용이 들어가지요</p>
                        <p>⭐⭐⭐</p>
                        <p class="mycomment">여기에 코멘트가 들어갑니다.</p>
                    </div>
                </div>
            </div>
            <div class="col">
                <div class="card">
                    <img src="https://movie-phinf.pstatic.net/20210728_221/1627440327667GyoYj_JPEG/movie_image.jpg"
                         class="card-img-top" alt="...">
                    <div class="card-body">
                        <h5 class="card-title">여기에 제목이 들어갑니다</h5>
                        <p class="card-text">여기에 내용이 들어가지요</p>
                        <p>⭐⭐⭐</p>
                        <p class="mycomment">여기에 코멘트가 들어갑니다.</p>
                    </div>
                </div>
            </div>
    </div>

</div>

</body>

</html>


강의 따라하면서 진행했는데 버튼부터 자바스크립트까지 강의 내용이 반영이 안되서요 ㅜ 
ㅇ어떤 부분이 잘못된건가요??
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