bootstrap : 响应式导航

<!DOCTYPE html>
<html >
  <head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <title>响应式导航</title>
    <link rel="stylesheet" href="./css/bootstrap.min.css" />
    <style>
      * {
        margin: 0;
        padding: 0;
      }
      .nav-title {
        font-family: "Abril Fatface", cursive;
      }
      .navbar-header .nav-title:hover,
      .navbar-header .nav-title:focus {
        background: #fff;
        color: #000;
      }

      .cative {
        font-family: "Comfortaa", cursive;
      }
      .navbar-collapse .navbar-nav li a:hover,
      .navbar-collapse .navbar-nav li a:focus {
        color: #000;
        background: #fff;
      }
    </style>
  </head>
  <body>

    <nav class="navbar navbar-default navbar-fixed-top" role="navigation">
      <div class="container">
        <div class="navbar-header">
          <button
            type="button"
            class="navbar-toggle"
            data-toggle="collapse"
            data-target="#navbar-menu"
          >
            <span class="sr-only">切换导航</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </button>
          <a href="#" class="navbar-brand nav-title">YinyouPoet</a>
        </div>
        <div class="collapse navbar-collapse" >
          <ul class="nav navbar-nav navbar-right">
            <li class="cative"><a href="#">Home</a></li>
            <li class="cative"><a href="#">About</a></li>
            <li class="cative"><a href="#">Portfolio</a></li>
            <li class="cative"><a href="#">Contact</a></li>
          </ul>
        </div>
      </div>
    </nav>

    <script src="./js/jquery-3.4.1.min.js"></script>
    <script src="./js/bootstrap.min.js"></script>
  </body>
</html>