Moved code block text closer to code block

Changed `.content .p` from `margin:1.5em 0;` to `margin:2em 0 0 0;` so the vertical visual hierarchy was easier to read. Now the title is closer to code block being referenced.

Before and after image: [i.imgur.com/P0Xc7J0.png](http://i.imgur.com/P0Xc7J0.png)


[Reference](http://kaikkonendesign.fi/typography/section/5)