minor css updates


![basic icons](https://f.cloud.github.com/assets/4712046/2238386/a2a7dabe-9beb-11e3-897e-76209138e4ea.png)


![corner labels](https://f.cloud.github.com/assets/4712046/2238385/659b2b80-9beb-11e3-9800-8b0a69192fed.png)