Current patch
![current_patch](https://f.cloud.github.com/assets/3644868/2292723/38ab8256-a05e-11e3-8e7c-f2428d6b891b.png)

With 8.8rem and 4.2rem
![other](https://f.cloud.github.com/assets/3644868/2292726/43778630-a05e-11e3-8d6f-d9ee3617756b.png)

As I said, I expected the last value to be read, but it's definitely not happening. Also, dialer is using those calculated values https://github.com/mozilla-b2g/gaia/blob/master/apps/communications/dialer/style/oncall.css#L874 but I realized it only later