https://github.com/NodeBB/NodeBB/issues/4499

less/posts_list.less

@@ -7,6 +7,11 @@
 		width: 100%;
 		margin-bottom: 0px;
 
+		&.deleted {
+			-moz-opacity: 0.30;
+			opacity: 0.30;
+		}
+
 		.user-img {
 			.user-icon-style(@icon-radius * 2px, 1.5rem, 50%);
 			position: absolute;

templates/partials/posts_list.tpl

@@ -1,7 +1,7 @@
 <ul component="posts" class="posts-list" data-nextstart="{nextStart}">
 
 	<!-- BEGIN posts -->
-	<li component="post" class="posts-list-item row" data-pid="{posts.pid}" data-uid="{posts.uid}">
+	<li component="post" class="posts-list-item row <!-- IF posts.deleted -->deleted<!-- ENDIF posts.deleted -->" data-pid="{posts.pid}" data-uid="{posts.uid}">
 		<div class="col-lg-11 col-sm-10 col-xs-9 post-body">
 			<a class="topic-title" href="{config.relative_path}/topic/{posts.topic.slug}/{posts.index}">
 				<!-- IF !posts.isMainPost -->RE: <!-- ENDIF !posts.isMainPost -->{posts.topic.title}