Keep article padding throughout widths (#152)

Fixes #130

layouts/_default/single.html

@@ -5,7 +5,7 @@
 
 {{ define "main" }}
   {{ $section := .Site.GetPage "section" .Section }}
-  <article class="flex-l flex-wrap justify-between mw8 center ph3 ph0-l">
+  <article class="flex-l flex-wrap justify-between mw8 center ph3">
 
     <header class="mt4 w-100">
       <p class="f6 b helvetica tracked">