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<html><head><style>ul { list-style-type: none; margin: 0; padding: 0; width: 200px; background-color: #f1f1f1;}li a { display: block; color: #000; padding: 8px 16px; text-decoration: none;}li a.active { background-color: #04AA6D; color: white;}li a:hover:not(.active) { background-color: #555; color: white;}</style></head><body><h2>Vertical Navigation Bar</h2><p>In this example, we create an "active" class with a green background color and a white text. The class is added to the "Home" link.</p><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></body></html>