better stroke for webkit

The stroke was a bit scrambled: 
![orig](https://cloud.githubusercontent.com/assets/248973/3710478/c420f25e-148e-11e4-8543-26d27b9890ac.jpg)

So I added some width for it:
![edit](https://cloud.githubusercontent.com/assets/248973/3710480/d8518072-148e-11e4-8d94-32bc5b763fae.jpg)

Still not perfect - the stroke is a bit too wide, but it's more consistent now.

Extra 9 lines changed: 
I only changed line 41. I cannot explain why all the other lines (whitespace / IDE issue) were changed.