Change trail type and image size at larger breakpoints

#### Before
![google chrome](https://f.cloud.github.com/assets/80089/1280020/0319b780-2f47-11e3-8d76-ea202b0853ae.png)


#### After
![google chrome](https://f.cloud.github.com/assets/80089/1280023/08288de6-2f47-11e3-9cde-66ed3f3add05.png)