2-4 jquery연습 오류 | 스파르타 커뮤니티

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2-4 jquery연습 오류
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2-4강 jquery 연습중에 페이지를 처음 로드할때 블록을 닫고 시작하려고 display: none;으로 지정하는데 pycharm에서 자꾸 오류가 뜨고 자동 편집을 하면 고쳐서 되는데 아래 사진처럼 떠요. 강의에서는 그냥 .mypost내에 추가해서 가능했는데 제꺼에서는 따로 정의하게 하네요 ㅠㅠ
작성한 코드 및 에러 메세지
<!doctype html>
<html lang="ko">

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

        .movietitle {

            height: 250px;
            width: 100%;

            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;
        }

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

            background-color: transparent;

            color: white;

            border-radius: 50px;
            border: 1px solid white;

            margin-top: 10px;
        }

        .movietitle > button:hover {
            border: 3px solid white;
        }

        .mycomment {
            border: 2px solid black;
            color: gray;
        }

        .wrap {
            width: 1200px;
            margin: 20px auto 0px auto;
        }

        .mypost {
            width: 500px;

            margin: 20px auto 0px auto;

            box-shadow: 0px 0px 3px 0px gray;
            padding: 20px

        }

        .mypost {
            display: none;
        }

        .commentbutton {
            display: flex;
            flex-direction: row;
            align-items: center;
            justify-content: center;

            margin: 30px auto 0px auto;
        }

        .commentbutton > button {
            margin-right: 10px;
        }

    </style>
    <script>
        function open_box() {
            $('#post-box').show()

        }

        function close_box() {
            $('#post-box').hide()

        }
    </script>
</head>

<body>
<div class="movietitle">
    <h1>내 생의 최고의 영화들</h1>
    <!-- <button>영화 리스트</button>--!>
    <button onclick="open_box()">영화리스트</button>
</div>
<div class="mypost" id="post-box">
    <div class="form-floating mb-3">
        <input type="movieurl" class="form-control" id="url" placeholder="https:">
        <label for="floatingInput">영화 URL</label>
    </div>
    <div class="input-group mb-5">
        <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="floatingTextarea2"
                      style="height: 150?<>:px"></textarea>
        <label for="floatingTextarea2">코멘트</label>
    </div>
    <div class="commentbutton">
        <button type="button" class="btn btn-dark">기록하기</button>
        <button onclick="close_box()" type="button" class="btn btn-outline-secondary">닫기</button>
    </div>
</div>
<div class="wrap">
    <div id="cards-box" class="row row-cols-4 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 들어갑니다.</p>
                    <p>⭐⭐⭐</p>
                    <p class=mycomment>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 들어갑니다.</p>
                    <p>⭐⭐⭐</p>
                    <p class=mycomment>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 들어갑니다.</p>
                    <p>⭐⭐⭐</p>
                    <p class=mycomment>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 들어갑니다.</p>
                    <p>⭐⭐⭐</p>
                    <p class=mycomment>코멘트가 들어갑니다</p>
                </div>
            </div>
        </div>
    </div>
</div>
</body>

</html>
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