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    /* To limit the menu width to the content of the menu: */
    display: inline-block;
    /* Or set the width explicitly: */
    /* width: 10em; */
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<div class="pure-menu custom-restricted-width">
    <span class="pure-menu-heading">Yahoo Sites</span>

    <ul class="pure-menu-list">
        <li class="pure-menu-item"><a href="#" class="pure-menu-link">Flickr</a></li>
        <li class="pure-menu-item"><a href="#" class="pure-menu-link">Messenger</a></li>
        <li class="pure-menu-item"><a href="#" class="pure-menu-link">Sports</a></li>
        <li class="pure-menu-item"><a href="#" class="pure-menu-link">Finance</a></li>
        <li class="pure-menu-heading">More Sites</li>
        <li class="pure-menu-item"><a href="#" class="pure-menu-link">Games</a></li>
        <li class="pure-menu-item"><a href="#" class="pure-menu-link">News</a></li>
        <li class="pure-menu-item"><a href="#" class="pure-menu-link">OMG!</a></li>
    </ul>
</div>