Updated assets

_mixins.pug

 mixin responsive_image(thumb, fallback, urls, sizes, aspect_ratio)
-  .responsive.placeholder(style=`padding-bottom: ${aspect_ratio}`)&attributes(attributes)
+  .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)