Refactoring things

Just a bit more code cleanup. Still wondering where some of the numbers are coming from though -- figuring that out could help make some nice DRY loops :)
@una did you mean here `margin`, or does `margin-top` accept 4 values? I'd use: 

```css
margin: ($card-padding * -1) ($card-padding * -1) ($card-padding * -1) $card-padding;
```