Merge pull request #620 from abouthiroppy/fix/replace-scroll-with-auto

Replace `scroll` with `auto`

Author: stevemao

layouts/css/base.styl

@@ -71,7 +71,7 @@ pre
     font-size 0.8em
     white-space pre-wrap
     color $light-gray3
-    overflow-x scroll
+    overflow-x auto
 
     code
         color $light-gray3