Responsive list items

Responsive list items

I have a list items and I would like them auto expand to parent width. My
html looks like this:
<div class="wrapper">
<div class="playlistHolder">
<div class="playlist_inner">
<ul>
<li>Coffee</li>
<li>Tea</li>
<li>Milk</li>
</ul>
</div>
</div>
</div>
wrapper needs to be 100% browser width.
playlistHolder and list items inside need to be 100% width and responsive
so they follow the width of the wrapper.
How can I achieve that with css?