Enable CSS autoprefixer on development build (#178)

diff --git a/landing-pages/site/layouts/partials/hooks/head-end.html b/landing-pages/site/layouts/partials/hooks/head-end.html
index da1307c..a804a7f 100644
--- a/landing-pages/site/layouts/partials/hooks/head-end.html
+++ b/landing-pages/site/layouts/partials/hooks/head-end.html
@@ -19,7 +19,7 @@
 
 {{ $scssMain := "scss/main-custom.scss"}}
 {{ if .Site.IsServer }}
-    {{ $css := resources.Get $scssMain | toCSS (dict "enableSourceMap" true) }}
+    {{ $css := resources.Get $scssMain | toCSS (dict "enableSourceMap" true) | postCSS }}
     <link href="{{ $css.RelPermalink }}" rel="stylesheet">
 {{ else }}
     {{ $css := resources.Get $scssMain | toCSS (dict "enableSourceMap" false) | postCSS | minify | fingerprint }}