Styling Author Lists (wp_list_authors)

I will preface this post by stating that I have an understanding of CSS & .PHP, but I do have limited experience in actually using it. I’ve been learning as I go and have used CSS in the past with success – unfortunately I have gotten stuck on an issue.

I have created an author/users list by using the WP_List_Authors function – I have placed the function in the sidebar and so far the list is functioning correctly. As of right now it is displayed as a simple html hyperlink list (i.e. blue underlined text). I would like to add some style to it like changing the font, color, etc., but this is where I am having difficulty and my lack of experience is the cause.

I am able to adjust all the “ul” lists on the site, but I specifically would like to adjust the wp_list_authors list. I read the the article on Stylizing Lists with CSS, but I am having difficulty achieving the changes I am trying to implement. Here is what I have done thus far after reading the mentioned articles above:

Added the following to Sidebar.php:
<h2>List of authors:</h2>
<ul id=”authorlist”>
<?php wp_list_authors(); ?>

Added the following to style.css:
#authorlist {
color:#f78e1e
font-style:italic;
}
#authorlist ul {
color:#f78e1e
}
#authorlist ul li {
color:#f78e1e
}

Please note, the exact style above is just for testing purposes; that will be changed once I can successfully make the changes.

I am currently using Twenty-Twelve for my theme.

I appreciate your help; thank you!