Improve the .tour .button

1. Again, might be just me, but I think the button looks kinda squeezed right now. 

**Before**

![Screen Shot 2013-04-10 at 19 49 50](https://f.cloud.github.com/assets/380/363558/197a72b2-a207-11e2-877d-1573f491f05f.png)

**After**

![Screen Shot 2013-04-10 at 19 49 57](https://f.cloud.github.com/assets/380/363559/2049d06a-a207-11e2-8fb8-552fb34d5e4a.png)

2. Missing `:active` state makes my OCD sad, so:

![Screen Shot 2013-04-10 at 19 46 57](https://f.cloud.github.com/assets/380/363545/e439ba40-a206-11e2-9291-cc522bd79135.png)