change dpi option in pdf to 400 so that an a4 page is a4 again

app/controllers/certificates_controller.rb

@@ -12,7 +12,9 @@ class CertificatesController < ApplicationController
       format.html
       format.pdf do
         render pdf: pdf_file_name(@certificate),
-          layout: 'certificate.pdf', print_media_type: true, no_background: true,
+          show_as_html: params.key?('debug'),
+          layout: 'certificate.pdf',
+          dpi: '400',
           margin: { top: 0, bottom: 0, left: 0, right: 0 }
       end
     end

app/views/certificates/show.pdf.slim

@@ -32,7 +32,7 @@
 
     .text-body= markdown(@certificate.text_body)
 
-  .signature.row
+  .signature
     .col-xs-8
       .name= @certificate.creator_name
       .position= @certificate.creator_function

config/initializers/wicked_pdf.rb

@@ -10,5 +10,8 @@
 
 WickedPdf.config = {
   layout: 'pdf.html',
-  encoding: 'UTF-8'
+  encoding: 'UTF-8',
+  page_size: 'A4',
+  print_media_type: true,
+  no_background: true
 }