CSS Styling for Comments; combining classes

I want to style the author comment in a different color. My trouble is styling the small css style. I was trying to combine two classes: the li.authorcomment plus the .commentlist small. Here is my code that I added to the comments.php.

<li class="<?php if ( $comment->comment_author_email == get_the_author_email() ) echo 'authorcomment'; else echo $oddcomment; ?>" id="comment-<?php comment_ID() ?>">

and this is the styling:

.commentlist {padding-left:30px;}

.commentlist p {font: 1.2em Georgia, “Times New Roman”, Times, serif;}

.commentlist blockquote {color:#76767a; background:#f2f2f2;padding:6px 14px;margin:18px 35px;border-right:1px solid #DDD; border-bottom:1px solid #DDD;}
.commentlist li {margin: 15px 0 3px;padding: 8px 15px 10px 15px;background:#f2f2f2;border-top: 1px solid #ddd;}

#commentform small {background:#FFF;font-weight:bold;padding:0;}

.commentmetadata {display: block;}

.commentlist small {background:#e9e9e9}

.commentlist cite {font: 1.6em Georgia, “Times New Roman”, Times, serif;font-weight:bold;letter-spacing:-0.05em;}

li.authorcomment { background-color: #eef5e1;}
li.authorcomment .commentlist small {background:#BAD685;}