remove h3 class from block pages

layouts/partials/blocks/templates/posts/highlight.html

@@ -36,7 +36,7 @@
                 <a href="{{ .Permalink }}" itemprop="url" title="{{ safeHTML (i18n "commons.more_aria" (dict "Title" $title)) }}">{{ $title }}</a>
               {{ $heading_tag.close }}
               {{ if and $options.subtitle .Params.subtitle }}
-                <p class="post-subtitle h3">{{ partial "PrepareHTML" .Params.subtitle }}</p>
+                <p class="post-subtitle">{{ partial "PrepareHTML" .Params.subtitle }}</p>
               {{ end }}
               {{ if and $options.subtitle .Params.subtitle }}
                 </hgroup>