步骤 1) 添加 HTML：

创建导航栏：

例子

<div id=”navbar”>
  <a href=”#home”>Home</a>
  <a href=”#news”>News</a>
  <a href=”#contact”>Contact</a>
</div>

步骤 2) 添加 CSS：

设置导航栏样式：

例子

#navbar {
  background-color: #333; /* Black background color */
  position: fixed; /* Make it stick/fixed */
  top: -50px; /* Hide the navbar 50 px outside of the top view */
  width: 100%; /* Full width */
  transition: top 0.3s; /* Transition effect when sliding down (and up) */
}

/* Style the navbar links */
#navbar a {
  float: left;
  display: block;
  color: white;
  text-align: center;
  padding: 15px;
  text-decoration: none;
}

#navbar a:hover {
  background-color: #ddd;
  color: black;
}