回答編集履歴
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li -> div
    
        answer	
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                    padding:0px;
         
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                }
         
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            ```
         
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            とするといかがですか
         
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            とするといかがですか
         
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            追記:
         
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            以下だといかがでしょうか
         
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            ```
         
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            <div class="wrapper">
         
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                <p class="message">↓のボタンをクリックしてください↓</p>
         
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                <div class="sortNav">
         
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                    <div class="btnGreen">Green</div>
         
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                    <div class="btnRed">Red</div>
         
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                    <div class="btnBlue">Blue</div>
         
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                    <div class="btnAll">All</div>
         
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                </div>
         
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                <div class="container">
         
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                    <div class="green">sample</div>
         
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                    <div class="blue">sample</div>
         
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                    <div class="red">sample</div>
         
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                    <div class="green">sample</div>
         
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                    <div class="blue">sample</div>
         
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                    <div class="red">sample</div>
         
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                    <div class="green">sample</div>
         
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                    <div class="blue">sample</div>
         
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                    <div class="red">sample</div>
         
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                    <div class="green">sample</div>
         
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                    <div class="blue">sample</div>
         
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                    <div class="red">sample</div>
         
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                    <div class="green">sample</div>
         
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                    <div class="blue">sample</div>
         
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                    <div class="red">sample</div>
         
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                </div>
         
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            </div>
         
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            <style>
         
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                .wrapper {
         
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                    width:600px;
         
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                    margin: 30px auto;
         
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                }
         
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                .message {
         
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                    margin-bottom: 10px;
         
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                }
         
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                .sortNav {
         
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                    overflow: hidden;
         
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                    margin-bottom: 30px;
         
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                }
         
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                .sortNav div {
         
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                    list-style:none;
         
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                    float: left;
         
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                    margin-left: 10px;
         
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                    color: #fff;
         
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                    font-weight: bold;
         
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                    padding: 5px 10px;
         
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                    cursor: pointer;
         
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                    border-radius: 15px;
         
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                }
         
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                .green,.blue,.red {
         
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                    width: 50px;
         
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                    height: 50px;
         
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                    line-height: 50px;
         
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                    verticel-align: middle;
         
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                    text-align: center;
         
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                    margin: 10px;
         
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                    font-size: 10px;
         
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                    color: #fff;
         
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                    float: left;
         
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                }
         
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                .green, .btnGreen {
         
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                    background-color: #238C00;
         
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                }
         
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                .blue, .btnBlue {
         
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                    background-color: #00f;
         
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                }
         
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                .red, .btnRed {
         
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                    background-color: #f00;
         
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                }
         
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                .btnAll {
         
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                    background-color: #999;
         
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                }
         
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            </style>
         
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            <script
         
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                    src="https://code.jquery.com/jquery-3.4.1.min.js"
         
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                    integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo="
         
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                    crossorigin="anonymous"></script>
         
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            <script>
         
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                $(function(){
         
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                    $('.sortNav div').each(function(){
         
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                        $(this).click(function(){
         
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                            var btnName = $(this).attr("class").substring(3).toLowerCase();
         
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                            var className = '.';
         
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                            className += btnName;
         
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                            if(btnName == 'all') {
         
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                                $('.container > div').fadeIn(200);
         
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                            } else {
         
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                                $('.container div:not(className)').hide();
         
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                                $(className).fadeIn(200);
         
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                            }
         
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                        });
         
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                    });
         
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                });
         
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            </script>
         
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            ```
         
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