[Plugin: Author Avatars List] Problems customizing #user style

hi there – very useful plugin, thanks. quick question: i’m trying to style the hover properties of a user image. i just want to turn off the text-decoration for the image, not the name. this doesn’t work:

.shortcode-author-avatars div.author-list .user a .avatar{
	text-decoration: none;
}

this works, but it’s not what i want to do:

.shortcode-author-avatars div.author-list .user a {
	text-decoration: none;
}

thanks for any advice.