diff --git a/src/backoffice/templates/backoffice/assembly_detail.html b/src/backoffice/templates/backoffice/assembly_detail.html
index febcf535ad0872dcf014fb1b0237becbb06efadc..0d32c56d58111e03b13301d299d1eaaa7514ce71 100644
--- a/src/backoffice/templates/backoffice/assembly_detail.html
+++ b/src/backoffice/templates/backoffice/assembly_detail.html
@@ -72,7 +72,7 @@
       {% if assembly.banner_image %}
       <div class="card-header">{{ assembly.banner_image_width }}x{{ assembly.banner_image_height }}px</div>
       <div class="card-body">
-        <img src="{{ assembly.banner_image.url }}" alt="Banner Image">
+        <img src="{{ assembly.banner_image.url }}" alt="Banner Image" class="img-fluid">
       </div>
       {% else %}
       <div class="card-body">404 banner image :(</div>
@@ -131,4 +131,4 @@
     {% endif %}
   </div>
 </div>
-{% endblock %}
\ No newline at end of file
+{% endblock %}