.mention_name{
    font-size:12px;
}
.mention_username{
    font-size:12px;
    color:#999;
}
.mention_image{
    float: left;
    margin-right: 5px;
    -webkit-border-radius: 3px;
    -moz-border-radius: 3px;
    border-radius: 3px;
    width: 20px;
    height: 20px;
}

li.active .mention_username{
    color:#fff;
}