Подсветка тем, в которых отвечал пользователь

.discussionList .memberParticipatedThread {
    background-color: #DCF2D4 !important;
}

.discussionList .memberParticipatedThread .posterAvatar, .discussionList .memberParticipatedThread .stats {
    background-color: #DCF2D4 !important;
}

<li id="thread-{$thread.thread_id}" class="discussionListItem {$thread.discussion_state}{xen:if '!{$thread.discussion_open}', ' locked'}{xen:if {$thread.sticky}, ' sticky'}{xen:if {$thread.isNew}, ' unread'}{xen:if {$thread.prefix_id}, ' prefix{$thread.prefix_id}'}{xen:if {$thread.isIgnored}, ' ignored'} {xen:if $thread.thread_is_watched, threadWatched} {xen:if $thread.forum_is_watched, forumWatched}" data-author="{$thread.username}">

<li id="thread-{$thread.thread_id}" class="discussionListItem {$thread.discussion_state}{xen:if '!{$thread.discussion_open}', ' locked'}{xen:if {$thread.sticky}, ' sticky'}{xen:if {$thread.isNew}, ' unread'}{xen:if {$thread.prefix_id}, ' prefix{$thread.prefix_id}'}{xen:if {$thread.isIgnored}, ' ignored'} {xen:if $thread.thread_is_watched, threadWatched} {xen:if $thread.forum_is_watched, forumWatched} {xen:if {$thread.user_post_count}, ' memberParticipatedThread'}" data-author="{$thread.username}">