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HTML

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CSS

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CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <ul class="header-nav js-header-nav">
  <li><a href="#">Main</a></li>
  <li><a href="#News">News</a></li>
  <li><a href="#price">Price</a></li>
  <li><a href="#access">Access</a></li>
  <li><a href="#contact">Contact</a></li>
</ul>

<div class="box">
</div>
<div class="box2">
</div>
<div class="box3">
</div>

<script
  src="https://code.jquery.com/jquery-3.4.1.min.js"
  integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo="
  crossorigin="anonymous"></script>
!

CSS 

              
                ul,
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: #fff;
  text-decoration: none;
}
.fixed.header-nav {
  position: fixed;
  /* top: 0; ←はjQeryで指定済み*/
  background: rgba(119, 150, 56, .8);
}
.fixed.header-nav li:hover{
  background: rgba(104, 138, 35, .6);  
}
  /* 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);
}
.box {
  height: 1000px;
  width: 100%;
  background: skyblue;
}
.box2 {
  height: 1000px;
  width: 100%;
  background: rgb(236, 252, 203);
}
.box3 {
  height: 1000px;
  width: 100%;
  background: rgb(164, 164, 252);
}
!

JS 

              
                $(function() {
  let headNav = $(".js-header-nav");
  //scrollしたとき
  $(window).on("scroll", function() {
    //現在の位置が200px以上かつ、クラスfixedが付与されていない（false）時
    if ($(this).scrollTop() > 200 && headNav.hasClass("fixed") == false) {
      //headerの高さ分上に設定(上から降りてくるようにするため)
      headNav.css({ top: "-100px" });
      //クラスfixedを付与
      headNav.addClass("fixed");
      //位置を0に設定。１秒かけてアニメーションでにゅるっと降りてくる
      headNav.animate({ top: 0 }, 1000);
    } else if ($(this).scrollTop() <= 200 && headNav.hasClass("fixed") == true) {
      //現在の位置が200px以下かつ、クラスfixedが付与されている時にfixedを外す
      headNav.removeClass("fixed");
      
      //場合によってフロートナビゲーションの残像が残ることがあったので追記。必要ない場合は削除してください。
    } else if($(this).scrollTop() <= 200) { 
       headNav.removeClass("fixed");
    }
  });
});
!
999px

Console