<div class="sticky-header">
    <nav class="gnb">
      <ul class="gnb-list">
        <li class="gnb-item">
          <a href="#" class="link-gnb">Home</a>
        </li>
        <li class="gnb-item">
          <a href="#" class="link-gnb">About</a>
        </li>
        <li class="gnb-item">
          <a href="#" class="link-gnb">Favorite</a>           </li>
        <li class="gnb-item">
          <a href="#" class="link-gnb">Contact</a>
        </li>
      </ul>
    </nav>
  </div>
    * {
      margin: 0;
      padding: 0;
    }
    body {
      min-height: 3000px;
    }
    .sticky-header {
      position: sticky;
      left: 0;
      top: 0;
      background: royalblue;
    }
    .gnb-list {
      list-style: none;
      display: flex;
      justify-content: center;
      align-items: center;
      padding: 20px 0;
    }
    .link-gnb {
      display: block;
      padding: 0 50px;
      font-size: 23px;
      color: #fff;
      text-decoration: none;
    }

External CSS

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External JavaScript

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