Menus are VERTICAL by default. MINIMAL default styling and low-specificity selectors make them easy to customize. By default, menu items take up 100% of the width of their container, so you may want to limit the menu width or set the menu to display:inline-block.

eg:

YAHOO SITES
Flickr
Messenger
Sports
Finance
MORE SITES
Games
News
OMG!
Yahoo Sites

<style>
.custom-restricted-width {
/* To limit the menu width to the CONTENT of the menu: */
display: inline-block;
/* Or set the width EXPLICITLY: */
/* width: 10em; */
}
</style>
<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>

Menus are vertical by default. Minimal default styling and low-specificity selectors make them easy to customize. By default, menu items take up 100% of the width of their container, so you may want to limit the menu width or set the menu to display:inline-block.

eg:

YAHOO SITES
Flickr
Messenger
Sports
Finance
MORE SITES
Games
News
OMG!
Yahoo Sites

<style>
.custom-restricted-width {
/* To limit the menu width to the content of the menu: */
display: inline-block;
/* Or set the width explicitly: */
/* width: 10em; */
}
</style>
<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>