how to style nav bar in css code example

Example 1: html navigation bar

<!-- How to create a navigation bar:
 This is the html file:

 Put the class="active" in the html file/page you are coding in
 (e.g. put the class="active" in the Home.html file)
 To position a page link to the right do class="right"
-->
<body>
<ul class="topnav">
  <li><a class="active" href="Home.html">Home</a></li>
  <li><a href="Page1.html">Page1</a></li>
  <li><a href="Page2.html">Page2</a></li>
  <li class="right" ><a href="About.html">About</a></li>
</ul>
</body>

<!-- This is the css file:
 (have a play with the colours and features!)-->
ul.topnav {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
  font-family: arial;
  text-align: left;
  width: 100%;
  position: sticky;
  top: 0;
}
ul.topnav li {float: left;}
ul.topnav li a {
  display: block;
  color: white;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  float: left;
  font-size: 17px;
  border-right: 1px solid #bbb;
}
ul.topnav li a:hover:not(.active) {
	background-color: #ddd;
    color: black;
}
ul.topnav li a.active {
	background-color: #4CAF50;
}
ul.topnav li.right {
	float: right;
}
@media screen and (max-width: 720px) {
  ul.topnav li{
	  width: 100%;
  }
  ul.topnav a{
	  width: 100%;
  }
}
<!-- END -->

Example 2: navbar in css

<nav>
    <div class="nav-wrapper">
      <a href="#" class="brand-logo">Logo</a>
      <ul id="nav-mobile" class="right hide-on-med-and-down">
        <li><a href="sass.html">Sass</a></li>
        <li><a href="badges.html">Components</a></li>
        <li><a href="collapsible.html">JavaScript</a></li>
      </ul>
    </div>
  </nav>

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