Preview:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
}
​
.topnav {
  overflow: hidden;
  background-color: #333;
}
​
.topnav a {
  float: left;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}
​
.topnav a:hover {
  background-color: #ddd;
  color: black;
}
​
.topnav a.active {
  background-color: #4CAF50;
  color: white;
}
</style>
</head>
<body>
​
<div class="topnav">
  <a class="active" href="#home">Home</a>
  <a href="#news">News</a>
  <a href="#contact">Contact</a>
  <a href="#about">About</a>
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