make rgba in css color definition comply with standart

Hi
Don't know if you accept this commit, but I was slightly confused when found that rgba definition is not following css standard. I did found it out only when tried to render semi-transparent colored div's.
This patch changes rgba definition from
```
rgba(1.0,1.0,1.0,0.3)
```
to
```
rgba(255,255,255,1.0)
```