change selector for posts

assets/sass/_theme/blocks/posts.sass

@@ -10,7 +10,7 @@
         @include grid($block-posts-grid-columns, desktop)
     article
         @include author-and-time-side-to-side
-        > [itemprop=headline]
+        .post-title
             a
                 @include stretched-link
                 text-decoration: none
@@ -134,7 +134,7 @@
                     display: flex
                     flex-direction: column
                     padding-top: $spacing-2
-                    [itemprop=headline]
+                    .post-title
                         margin-bottom: 0
                     .post-categories
                         margin-bottom: 0
@@ -180,7 +180,7 @@
 
     &--highlight
         .highlight-post
-            [itemprop=headline]
+            .post-title
                 margin-bottom: $spacing-2
             .media
                 margin-bottom: $spacing-2
@@ -207,11 +207,11 @@
 
         @include media-breakpoint-up(desktop)
             .highlight
-                [itemprop=headline]
+                .post-title
                     @include h2
             .list
                 article
-                    [itemprop=headline]
+                    .post-title
                         @include h4
 
         @include in-page-with-sidebar
@@ -227,7 +227,7 @@
             .list
                 article
                     @include grid(8, desktop, 0, 0)
-                    [itemprop=headline]
+                    .post-title
                         grid-column: 1 / 7
                     .post-categories
                         grid-column: 1 / 7
@@ -323,7 +323,7 @@
         @include in-page-with-sidebar
             .post
                 width: columns(3)
-                [itemprop="headline"]
+                .post-title
                     @include h4
             .carousel
                 .actions-arrows

assets/sass/_theme/sections/posts.sass

@@ -25,7 +25,7 @@
             margin-bottom: $spacing-3
             padding-bottom: $spacing-3
             flex-direction: row
-            [itemprop=headline] + p
+            .post-title + p
                 margin-top: $spacing-2
             @include media-breakpoint-up(desktop)
                 @include grid
@@ -57,7 +57,7 @@
                     time
                         font-size: $h5-size
                 .post-content
-                    [itemprop=headline],
+                    .post-title,
                     > p
                         max-width: columns(6)
     .posts--grid

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

 {{ $heading_level := .heading_level | default 3 }}
 {{ $heading := printf "h%d" $heading_level }}
 {{ $heading_tag := (dict 
-  "open" ((printf "<%s itemprop='headline'>" $heading) | safeHTML)
+  "open" ((printf "<%s class='post-title' itemprop='headline'>" $heading) | safeHTML)
   "close" ((printf "</%s>" $heading) | safeHTML)
   ) }}
 <div class="highlight">