HTML <ul id="nav"> <li><a href="#section01">menu</a></li> <li><a href="#section02">menu</a></li> <li><a href="#section03">menu</a></li> </ul> </div> <div class="section" id="section01"> ..... </div> <div class="section" id="section02"> ..... </div> <div class="section" id="section03"> ..... </div> CSS body{ padding-top: 100px; } #nav{ position: fixed; top: 0; left: 0; width: 100%; } #nav ul{ overf