Change alignement of numbers in ASPR 7

Hello,
I converted a project from 6.3 to 7. On LIST pages I often use a centered alignment for fields type number (or text, validated as number).

Unfortunately these changes are accepted in Visual Editor but don't have an effect in browser (IEX 9, FireFox 7) but worked well with 6.3.
Has this changed or is it a bug in 7 / build 9685?
Philip