Fix style on long answer

Modified:
- css/app.css (style)
- partial/game.html (container)
- others (removed unused space/chars)

prevent answer to overflow below user image, see image below:
![wordchain-overflow](https://cloud.githubusercontent.com/assets/1614415/3012777/32698702-df3e-11e3-86cd-40515cdf281d.jpg)


1st answer is proposed fix
2nd answer is before fix