rich text class for block chapter

assets/sass/_theme/blocks/pages.sass

@@ -154,6 +154,9 @@
                         li
                             margin-top: 0
             @include in-page-without-sidebar
+                h2
+                    a
+                        @include stretched-link(before)
                 .block-content
                     @include grid
                     grid-row-gap: $spacing1

layouts/partials/blocks/templates/chapter.html

@@ -20,7 +20,7 @@
             </div>
           {{ end -}}
           {{ if (partial "GetTextFromHTML" .text) -}}
-          <div>
+          <div class="rich-text">
             {{ partial "PrepareHTML" .text }}
           </div>
           {{ end -}}