W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<head>
<style>
body {margin:0;}

ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
  position: fixed;
  top: 0;
  width: 100%;
}

li {
  float: left;
}

li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
}

li a:hover:not(.active) {
  background-color: #111;
}

.active {
  background-color: #04AA6D;
}
</style>
</head>
<body>

<ul>
  <li><a class="active" href="#home">Home</a></li>
  <li><a href="#news">News</a></li>
  <li><a href="#contact">Contact</a></li>
  <li><a href="#about">About</a></li>
</ul>

<div style="padding:20px;margin-top:30px;background-color:#1abc9c;height:1500px;">
  <h1>Fixed Top Navigation Bar</h1>
  <h2>Scroll this page to see the effect</h2>
  <h2>The navigation bar will stay at the top of the page while scrolling</h2>

</body>
</html>

​x
 
<!DOCTYPE html><html><head><style>body {margin:0;}​ul {  list-style-type: none;  margin: 0;  padding: 0;  overflow: hidden;  background-color: #333;  position: fixed;  top: 0;  width: 100%;}​li {  float: left;}​li a {  display: block;  color: white;  text-align: center;  padding: 14px 16px;  text-decoration: none;}​li a:hover:not(.active) {  background-color: #111;}​.active {  background-color: #04AA6D;}</style></head><body>​<ul>  <li><a class="active" href="#home">Home</a></li>  <li><a href="#news">News</a></li>  <li><a href="#contact">Contact</a></li>  <li><a href="#about">About</a></li></ul>​<div style="padding:20px;margin-top:30px;background-color:#1abc9c;height:1500px;">  <h1>Fixed Top Navigation Bar</h1>  <h2>Scroll this page to see the effect</h2>  <h2>The navigation bar will stay at the top of the page while scrolling</h2>​  <p>Some text some text some text some text..</p>  <p>Some text some text some text some text..</p>