Doesn't seem too difficult to me (JSFiddle).
HTML:
<header>
<a href="#1">Clickable</a>
<nav>
<ul>
<li>
<a href="#2">Clickable</a>
</li>
<li>
<a href="#3">Clickable</a>
</li>
<li>
<a href="#4">Clickable</a>
</li>
<li>
<a href="#5">Clickable</a>
</li>
</ul>
</nav>
</header>
?
CSS:
a { color: #f4ebd4; font-family: sans-serif; text-decoration: none; text-transform: uppercase; font-size: 0.8em; }
header { text-align: center; }
header > a { display: block; line-height: 100px; }
header > a, header > a + nav { background: #4b885c; }
a:hover, a:hover + nav { background: blue; }
nav ul { display: table; width: 100%; }
nav li { display: table-cell; }
nav a { display: block; background: #a51d2c; padding: 10px 20px; margin: 10px; }
?
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