Reduce post width / line length

Author: nicoburns

templates/post.hbs

@@ -1,6 +1,6 @@
 {{#*inline "page"}}
 <section id="{{post.title}}" class="white">
-  <div class="w-100 mw-none ph3 mw8-m mw9-l center f3">
+  <div class="w-100 mw-none ph3 mw8-m mw8-l center f3">
     <header>
       <h2>{{ post.title }}</h2>
       <div class="highlight"></div>