Updated assets

_mixins.pug

 mixin responsive_image(thumb, fallback, urls, sizes, aspect_ratio)
-  .responsive.placeholder(style=`padding-bottom: ${aspect_ratio}`)&attributes(attributes)
-    noscript
-      img(src=fallback sizes=sizes srcset=urls)
-    img(src=thumb, data-src=fallback, sizes=sizes, data-srcset=urls)
+  .responsive.container&attributes(attributes)
+    .responsive.placeholder(style=`padding-bottom: ${aspect_ratio}`)
+      noscript
+        img(src=fallback sizes=sizes srcset=urls)
+      img(src=thumb, data-src=fallback, sizes=sizes, data-srcset=urls)
 
 mixin theme_card(id, name)
   a.card(href="/assets/images/#{id}.png")