1.Responsive-Web-Design-Certification/3.Applied-Visual-Design/22.lock-an-element-to-the-browser-window-with-fixed-positioning.html

<style>
  body {
    min-height: 150vh;
  }
  #navbar {
    position: fixed;
    top: 0px;
    left: 0px;
    width: 100%;
    background-color: #767676;
  }
  nav ul {
    margin: 0px;
    padding: 5px 0px 5px 30px;
  }
  nav li {
    display: inline;
    margin-right: 20px;
  }
  a {
    text-decoration: none;
  }
</style>
<body>
  <header>
    <h1>Welcome!</h1>
    <nav id="navbar">
      <ul>
        <li><a href="">Home</a></li>
        <li><a href="">Contact</a></li>
      </ul>
    </nav>
  </header>
  <p>I shift up when the #navbar is fixed to the browser window.</p>
</body>