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                  <ul class="header-nav js-header-nav">
    <li><a href="index.html">INDEX</a></li>
    <li><a href="page2.html">PAGE2</a></li>
    <li><a href="page3.html">PAGE3</a></li>



li {
  margin: 0;
  padding: 0;
  list-style: none;

.header-nav {
  /* liアイテムを横並び */
  display: flex;
  /* ul全体の幅・高さ */
  width: 100%;
  height: 100px;
  background: pink;
.header-nav li {
  /* メニュー名を左右中央寄せ */
  text-align: center;
  /* li box の高さをulに合わせる */
  line-height: 100px;
  width: calc(100% / 5);
.header-nav li a {
  /* リンクをブロックいっぱいに */
  display: block;
  color: #000;
  text-decoration: none;
.fixed.header-nav {
  position: fixed;
  /* top: 0; ←はjQeryで指定済み*/
  background: rgba(255, 192, 203, .9);
  /* スクロールダウン時に下に影をつける*/
.fixed.header-nav {
  box-shadow: 0 10px 10px rgba(0,0,0,0.1);

.header-nav .current > a{
  color: #fff;

/* 現在のぺーじじゃなければ、ホバーで変わる */
.header-nav li a:not(.current):hover{
  /* リンクをブロックいっぱいに */
  opacity: .3;
  background: white;



    $('.header-nav li a').each(function(){
      var $href = $(this).attr('href');
      if(location.pathname.match($href)) {
      } else {