HTML
<div class="contain" role="main">
<nav class="menu-nav" role="navigation">
<li class="H01"onclick="document.body.style.backgroundColor = 'green';">01:00</li>
<li class="H02"onclick="document.body.style.backgroundColor = 'yellow';">02:00</li>
</nav>
</div>

CSS
body {
background-color: blue;
}