How to select in CSS that all list items appears only in hover state and in four columns-width 960px; (see image above). I don't know which tag to select in this case, see HTML below.
<div class="categories">
<li>
<a href="#">All categories</a>
<ul class="sub-menu">
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
<li><a href="#">All categories</a></li>
</ul>
</li>
</div>