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2-4 강의중에 display none이 안먹히는데 왜 그런건가요?
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2-4강의 2:18초쯤에 박스를 시작부터 안보이게 display : none; 을 쓰는데 강의와 다르게 제거는 작동이안되는데 왜 그런건가요?



스파르타 즉문즉답스파르타 즉문즉답




<!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: green;
          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;
      }
      .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:grey;
      }
      .wrap{
        max-width: 1200px;
        width: 95%;
        margin: 20px; auto 0px auto;

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

        box-shadow: 0px 0px 3px 0px gray;
        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(){
          $('#post-box').show()
      }
      function close_box(){
          $('#post-box').hide()
      }
  </script>
</head>

<body>
  <div class="mytitle">
      <h1>내 생의 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">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="floatingTextarea2"
                style="height: 100px"></textarea>
      <label for="floatingTextarea2">코멘트</label>
    </div>
    <div class="mybtn">
      <button type="button" class="btn btn-dark">기록하기</button>
      <button onclick="close_box()" type="button" class="btn btn-outline-dark">닫기</button>

    </div>

  </div>
  <div class="wrap">
    <div id="cards-box" 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">여기 제목</h5>
            <p class="card-text">여기 내용.</p>
            <p>⭐⭐⭐</p>
            <p class="mycomment">여기 코멘트</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">여기 제목</h5>
            <p class="card-text">여기 내용.</p>
            <p>⭐⭐⭐</p>
            <p class="mycomment">여기 코멘트</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">여기 제목</h5>
            <p class="card-text">여기 내용.</p>
            <p>⭐⭐⭐</p>
            <p class="mycomment">여기 코멘트</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">여기 제목</h5>
            <p class="card-text">여기 내용.</p>
            <p>⭐⭐⭐</p>
            <p class="mycomment">여기 코멘트</p>
          </div>
        </div>
      </div>

    </div>
  </div>

</body>

</html>




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