<div class="mytitle">
    <h1>내 생애 최고의 영화들</h1>
    <button onclick="open_box">영화 기록하기</button>
</div>
<div class="mypost" id="post-box">
    <div class="form-floating mb-3">
        <input type="email" class="form-control" id="url" 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="floatingTextarea2"
          style="height: 100px"></textarea>
        <label for="floatingTextarea2">코멘트</label>
    </div>
    <div class="mybtns">
        <button type="button" class="btn btn-dark">기록하기</button>
        <button onclick="close_box()" type="button" class="btn btn-outline-dark">닫기</button>

영화기록하기 버튼을 클릭해도 포스팅박스가 나타나지 않읍니다. 닫기 버튼을 누르면 포스팅박스가 닫기는 되는데...