More responsive site

- Make social links and quote bigger
- Make content width larger too

1 technique you can use is `max-width` rather than setting a fixed `width`. Alternatively, you can change that fixed width with media queries. 

Also `box-sizing: border-box` is very useful. By default, setting a width will exclude padding, borders, margins. So if you include those stuff, you need to adjust the `width` accordingly. http://css-tricks.com/box-sizing/