diff --git a/_layouts/post.html b/_layouts/post.html
index 7f1fef87..21570003 100755
--- a/_layouts/post.html
+++ b/_layouts/post.html
@@ -6,7 +6,13 @@
     {% if page.img -%}
     <div class="page-cover-image">
       <figure>
-        {% picture {{ "/assets/img/" | prepend: site.baseurl | append : page.img}} center --alt {{page.title}} --class page-image %}
+        {%
+          picture
+          top-image-post
+          {{ "/assets/img/" | prepend: site.baseurl | append : page.img}} 16:9 center
+          mobile: {{ "/assets/img/" | prepend: site.baseurl | append : page.img}} 4:3 center
+          --alt {{page.title}} --class page-image
+        %}
         {% if page.fig-caption -%}
           <figcaption>{{page.fig-caption}}</figcaption>
         {%- endif %}