(숙제 질문) 어디서 생긴 테두리인지 모르겠는데 자꾸 테두리가 하나 더 생겨요ㅠㅠ

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(숙제 질문) 어디서 생긴 테두리인지 모르겠는데 자꾸 테두리가 하나 더 생겨요ㅠㅠ

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자꾸 닉네임 응원댓글 상자 테두리 외에 크게 테두리가 나타납니다.. 이유를 모르겠어요ㅠㅠ

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            width: 100%;
            height: 200px;

            background-image: linear-gradient(0deg, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('https://i.ytimg.com/vi/bYleMOXKggY/hq720.jpg?sqp=-oaymwEXCNAFEJQDSFryq4qpAwkIARUAAIhCGAE=&rs=AOn4CLCfWHF1JwlRTspzK8CuUT6kCEUgHg');
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            width: 95%;

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        .card-body{
            margin: 15px auto 0px auto;
            box-shadow: 0px 0px 3px 0px gray;
            padding: 20px;
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<body>
    <h1 class="mytitle">십센치(10cm) 팬명록</h1>
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    <div class="mycomment">
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            <blockquote class="blockquote mb-0">
                <p>새로운 앨범 너무 멋져요!</p>
                <footer class="blockquote-footer"> 호빵맨 </footer>
            </blockquote>
        </div>
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            <blockquote class="blockquote mb-0">
                <p>새로운 앨범 너무 멋져요!</p>
                <footer class="blockquote-footer"> 호빵맨 </footer>
            </blockquote>
        </div>
        <div class="card-body">
            <blockquote class="blockquote mb-0">
                <p>새로운 앨범 너무 멋져요!</p>
                <footer class="blockquote-footer"> 호빵맨 </footer>
            </blockquote>
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