<link rel="stylesheet" href="css-responsive-menu.css" />
<div class="css-responsive-menu">
<label for="hidden-checkbox1" class="expand-control">Menu</label>
<input type="checkbox" id="hidden-checkbox1" class="expand-control">
<ul class="navigation-list">
<li><a href="about.html">about</a></li>
<li><a href="contact.html">contact</a></li>
</ul>
</div>