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HTML

              
                <!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
    <link rel="stylesheet" href="sample.css">
    <script src="sample.js"></script>
    <title>テスト</title>
</head>
<body>
<header>
  <div class="container">
    <div class="header_left">
      <h1>プログラミングクエスト</h1>
    </div>
    <div class="header_right">
      <ul class="menu_list">
        <li class="nav_item"><a href="#" class="js-dropdown">menu1</a>
          <div class="panel js-dropdown-menu">
            <ul class="panel-inner">
              <li class="panel_item"><a href="#">ドロップメニュー</a></li>
              <li class="panel_item"><a href="#">ドロップメニュー</a></li>
              <li class="panel_item"><a href="#">ドロップメニュー</a></li>
            </ul>
          </div>
        </li>
        <li class="nav_item"><a href="#" class="js-dropdown">menu2</a>
          <div class="panel js-dropdown-menu">
            <ul class="panel-inner">
              <li class="panel_item"><a href="#">ドロップメニュー</a></li>
              <li class="panel_item"><a href="#">ドロップメニュー</a></li>
              <li class="panel_item"><a href="#">ドロップメニュー</a></li>
            </ul>
          </div>
        </li>
        <li class="nav_item"><a href="#">menu3</a></li>
        <li class="nav_item"><a href="#">menu4</a></li>

      </ul>
    </div>
  </div>
</header>
</body>
</html>

              
            
!

CSS

              
                * {
  margin: 0;
  padding: 0;
}

body {
  margin: 0;
  padding: 0;
}

ul, li {
  list-style: none;
}

a {
  text-decoration: none;
}

.container {
  width: 1180px;
  max-width: 100%;
  margin: 0 auto;
}

header {
  background: #6bb6ff;
}

header > .container {
  display: flex;
  align-items: center;
  height: 80px;
}

header .header_left h1 {
  color: #fff;
}

header .header_right {
  margin-left: 8em;
}

header .header_right .menu_list {
  display: flex;
  justify-content: space-around;
}

header .header_right .menu_list .nav_item {
  position: relative;
}

header .header_right .menu_list .nav_item .panel {
  position: absolute;
  top: 52px;
  left: 0;
  right: 0;
  margin: auto;
  overflow: hidden;
  background: #6bb6fe;
  width: 100%;
  display: none;
}

header .header_right .menu_list .nav_item .panel .panel_item {
  display: inline-block;
  margin: 20px 0;
}

header .header_right .menu_list .nav_item .panel .panel_item a {
  color: #fff;
}

header .header_right .menu_list .nav_item {
  display: block;
  width: 150px;
  text-align: center;
}

header .header_right .menu_list .nav_item a {
  color: #fff;
}

              
            
!

JS

              
                $(function(){
  var $dropdown = $('.js-dropdown');
  var DURATION = 200; //アニメーションの速さ

  function fadeOutMenu(){
    $dropdown.removeClass('is-active')
      .next('.js-dropdown-menu')
      .stop()
      .slideUp(DURATION);
  }

  //表示を切り替える
  function toggleMenu(){
    var $self = $(this); //thisにはクリックした時の要素が入る
    //要素が.is-activeを持っていない場合
    if(!$self.hasClass('is-active')){
      fadeOutMenu();
    }
    //クリックした要素を表示させる
    $self.toggleClass('is-active')
      .next('.js-dropdown-menu')
      .stop().slideToggle(DURATION);
  }

  $dropdown.on('click', toggleMenu);
 
//別の場所をクリックすると閉じる処理
  $(document).on('click touchend', function(event) {
  if (!$(event.target).closest('body').length) {
    // ここに処理;
    fadeOutMenu();//関数呼びだし
  }
});
  });
              
            
!
999px

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