mk-webwork codenote
<header class="header">
    <div class="header__wrapper">
        <div class="header__logo">
          <a href="../index.html">
            <img src="名称未設定-1.png" alt="サイトタイトル">
          </a>
        </div>
        <ul class="header__linklist">
          <li class="header__linklist-link"><a href="">リンク1</a></li>
          <li class="header__linklist-link"><a href="">リンク2</a></li>
          <li class="header__linklist-link"><a href="">リンク3</a></li>
          <li class="header__linklist-link"><a href="l">リンク4</a></li>
        </ul>
        <div id="open-button" class="open-button"><span></span></div>
        <nav class="header__navigation">
        <div class="header__logo">
          <a href="../index.html">
            <img src="名称未設定-1.png" alt="サイトタイトル">
          </a>
        </div>
        <div id="close-button" class="close-button"></div>
            <ul class="navigation__linklist">
                <li class="navigation__linklist-list"><a href="">リンク1</a></li>
                <li class="navigation__linklist-list"><a href="">リンク2</a></li>
                <li class="navigation__linklist-list"><a href="">リンク3</a></li>
                <li class="navigation__linklist-list"><a href="">リンク4</a></li>
            </ul>
         </nav>
    </div>
</header>
/* header */
  .header__wrapper {
    position: fixed;
    max-width: 1320px;
    background-color: #fff;
    margin: 0 auto;
    text-align: left;
    padding: 5px 10px 10px;
    display: flex;
    justify-content: space-between; 
    z-index: 999;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
  }
  .header__logo {
    display: inline-block;
    padding-right: 20px;
  }
  .main__logo {
    font-size: 4.0rem;
    font-weight: 100;
  }
  .header__logo h3 {
    font-size: 1.4rem;
    font-weight: 100;
    letter-spacing: 0.5rem;
  }
  .header__navigation {
    display: none;
  }
  /* header__linklist */
  .header__linklist {
    display: flex;
    text-align: right;
    position: relative;
    margin: auto 0 auto auto;
  }
  .header__linklist-link+.header__linklist-link {
    margin-left: 50px;
  }
  .header__linklist a {
    font-size: 2rem;
    font-weight: 100;
    padding: 15px 0;
  }
  /* header SP版 */
  @media(max-width:930px){
    .header__linklist {
      display: none;
    }
    .main__logo {
      font-size: 2.4rem;
    }
    .header__logo h3 {
      font-size: 1rem;
    }
    /*オープンボタン(.open-button)*/
    .open-button {
      display: block;
      position: absolute;
      right: 0;
      top: 20px;
      width: 40px;
      height: 40px;
      cursor: pointer;
    }
    .open-button span, .open-button span:before, .open-button span:after {
      position: absolute;
      height: 3px;
      width: 25px;
      border-radius: 3px;
      background: #777777;
      display: block;
      content: "";
    }
    .open-button span:before {
      bottom: -8px;
    }
    .open-button span:after {
      bottom: -16px;
    }
  /*オープンボタン(.open-button)ここまで*/
  }
  /* header SP版 ここまで*/
  /* ナビゲーション */
  .header nav {
    display: none;
    z-index: 1000;
    position: fixed;
    top: 0;
    left: 0;
    background-color: #FFFFFF;
    width: 90%;
    height: 750px;
    padding: 5px 10px;
    box-shadow: 3px 5px 5px rgba(0, 0, 0, 0.4);
  }
  .navigation__linklist {
    padding: 80px 0;
    margin: 0 auto;
    text-align: center;
    font-size: 2rem;
    font-weight: 100;
  }
  .navigation__linklist-list+.navigation__linklist-list {
    margin-top: 60px;
  }
  /*クローズボタン(.close-button)*/
  .close-button {
    display: block;
    position: absolute;
    top: 10px;
    right: 10px;
    width: 30px;
    height: 30px;
    }
  /*×印*/	
  .close-button::before,.close-button::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 3px;
    height: 28px;
    border-radius: 3px; /* 丸みの度合い */
    background: #333; /* バツ印の色 */
    }
    .close-button::before{
      transform: translate(-50%,-50%) rotate(45deg);
    }
    .close-button::after {
      transform: translate(-50%,-50%) rotate(-45deg);
    }
  /*×印ここまで*/
  /*クローズボタン(.close-button)ここまで*/
  /*ナビゲーションここまで*/
/* header ここまで */
//ナビゲーションopen-close
$('.close-button, .open-button').on("click",function () {
    $('.header nav').slideToggle();
    });

//Sample
		$('.close-button').on("click", function (){
				$('.header nav').slideUp();
		});
		$('.open-button').on("click", function () {
				$('.header nav').slideDown();
		});
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