Edit This Code:
<!DOCTYPE html>
<html>
<head>
<style>
ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;
}


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: #4CAF50;
}

</style>
</head>
<body>

<ul>
  <li><a href="tryit.asp-filename=trycss_navbar_horizontal_black_right.html#home">Home</a></li>
  <li><a href="tryit.asp-filename=trycss_navbar_horizontal_black_right.html#news">News</a></li>
  <li><a href="tryit.asp-filename=trycss_navbar_horizontal_black_right.html#contact">Contact</a></li>
  <li style="float:right"><a class="active" href="tryit.asp-filename=trycss_navbar_horizontal_black_right.html#about">About</a></li>
</ul>

</body>
</html>


Result:
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