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HTML

              
                <!DOCTYPE html>
<html lang="ja">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width,initial-scale=1"> 
        <title>モバイルTOP</title>
        <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
        <link rel="stylesheet" href="style2.css">
        <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
        <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
        <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
        <script src="https://kit.fontawesome.com/da0fa6be04.js" crossorigin="anonymous"></script>

        <!--[if lt IE 9]>
        <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
        <script src="http://css3-mediaqueries-js.googlecode.com/svn/trunk/css3-mediaqueries.js"></script>
        <![endif]-->
        <script src="js/script.js"></script>
    </head>
    <body>
        <!----- ヘッダー ----->
        <header>
            <div id="nav-drawer" class="bg-success py-2 px-3 text-right">
                <!-- チェックボックス -->
                <input id="nav-input" type="checkbox" class="nav-unshown">
                <!-- メニューボタンのアイコン -->
                <label id="nav-open" for="nav-input"><i class="fas fa-bars"></i></label>
                <!-- 本体カバー -->
                <label id="nav-close" for="nav-input"></label>
                <!-- メニュー -->
                <div id="nav-content">
                    <div class="mobile-nav border-bottom py-2 px-4"><a class="text-secondary" href="#">Top</a></div>
                    <div class="mobile-nav border-bottom py-2 px-4"><a class="text-secondary" href="#">HTML</a></div>
                    <div class="mobile-nav border-bottom py-2 px-4"><a class="text-secondary" href="#">JavaScript</a></div>
                    <div class="mobile-nav border-bottom py-2 px-4"><a class="text-secondary" href="#">PHP</a></div>
                </div>
            </div>
        </header>
        <!----- ヘッダー END ----->
    </body>
</html>
              
            
!

CSS

              
                #nav-drawer {
    /* ポジション指定 */
    position: relative;
}


.nav-unshown {
    /* 存在を消す */
    display:none;
}

/*アイコンのスペース*/
#nav-open {
    display: inline-block;
    width: 30px;
    height: 22px;
    vertical-align: middle;
}

/*閉じる用の薄黒カバー*/
#nav-close {
    display: none;/*はじめは隠しておく*/
    position: fixed;
    z-index: 99;
    top: 0;/*全体に広がるように*/
    left: 0;
    width: 100%;
    height: 100%;
    background: black;
    opacity: 0;
    transition: .3s ease-in-out;
}

/*中身*/
#nav-content {
    overflow: auto;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 9999;/*最前面に*/
    width: 80vw;/*右側に隙間を作る(閉じるカバーを表示)*/
    height: 100vh;
    background: #fff;/*背景色*/
    transition: .3s ease-in-out;/*滑らかに表示*/
    transform-origin: right top;
    transform: translateX(20vw) rotateY(90deg);/* 左に隠しておく */
}

/*チェックが入ったらもろもろ表示*/
#nav-input:checked ~ #nav-close {
    display: block;/*カバーを表示*/
    opacity: .5;
}

#nav-input:checked ~ #nav-content {
    transform: translateX(20vw) rotateY(0deg);/* 中身を表示(回転) */
    box-shadow: 6px 0 25px rgba(0,0,0,.15);
}

.mobile-nav {
    list-style: none;
}

.mobile-nav {
    text-decoration: none;
}

.mobile-nav:hover {
    background-color: rgb(231, 231, 231);
}
              
            
!

JS

              
                
              
            
!
999px

Console