안녕하세요. 코드를 다 적용해서 수업을 듣고 있는데, 박스팝업창이 계속뜹니다.

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안녕하세요. 코드를 다 적용해서 수업을 듣고 있는데, 박스팝업창이 계속뜹니다.
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2-4수업 중에
마지막에서 영화기록하기를 누르면 박스열기창이 팝업으로 뜨고
닫기를 누르면 박스닫기 팝업창이 계속뜨는데
그거를 안 뜨게 하는 방법이 따로 있나요?
<!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">
     <style>
        *{font-family: 'Gowun Dodum', sans-serif;}
        .mytitle {
            background-color: darkgreen;
            width: 100%;
            height: 200px;
            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;
            padding-top: 10px;
            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:1px solid white;
            margin-top:10px;

        }
        .mytitle>button:hover{
             border:2px solid white;
        }

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

        }
        .mypost {
            max-width: 500px;
            width:95%;

            margin: 10px auto 10px auto;
            box-shadow: 0px 0px 3px 0px;
        padding : 20px;
            display:none;

        }

        .mybtn{
            display: flex;
            flex-direction: row;
            justify-content: center;
            align-items: center;
            margin-top: 10px;
        }

        .mybtn>button{
                margin-right: 10px
        }


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

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

        }



    </script>
       </head>

    <body>
    <div class="mytitle">
        <h1> 내 생애 최고의 영화들</h1>
        <button onclick="open_box()"> 영화 기록하기</button>
    </div>

    <div class="mypost" id="post-box">
        간단한 글씨를 씁니다

        <div class="form-floating mb-3">
         <input type="email" class="form-control" id="url" placeholder="name@example.com">
         <label for="url">영화 URL</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">Comments</label>
        </div>
        <div class="mybtn">
            <button type="button" class="btn btn-dark">기록하기</button>
            <button onclick="close_box()" type="button" class="btn btn-light">닫기</button>
        </div>





</div>

</div>
    </div>
    <div class="wrap">
            </div>
    <div id="cards-box" class="row row-cols-1 row-cols-md-4 g-4">
       <div class="col">
            <div class="card h-100">
                <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 h-100">
                <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 h-100">
                <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 h-100">
                <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>
    </body>

    </html>
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