Maintenance: Provide valid css

* zoom is not a css property - whatever it is it is a hack and should be documented
and in the hack file if it is indeed doing anything
* word-break: break-word - i think what was meant was word-wrap: break-word
* correct a bad argument to background position

Change-Id: Icafa1090d3640465c787989a8f7783a0e222b25d
Merge "Maintenance: Provide valid css"