make code chunks a little smaller

Author: daattali

assets/css/beautifuljekyll.css

@@ -852,7 +852,7 @@ pre code {
 }
 
 pre {
-  font-size: 1rem;
+  font-size: 0.875rem;
   line-height: 1.5;
   border-radius: 0.25rem;
   padding: 0.59375rem;