Take a look at the tweak SubtleLock. I'm not on 8.4, so I've not tried it, but it states it works on iOS 8. When I used to use it, you could change the font color. Maybe it'll work?
Take a look at the tweak SubtleLock. I'm not on 8.4, so I've not tried it, but it states it works on iOS 8. When I used to use it, you could change the font color. Maybe it'll work?