Update Web UI CSS to adjust status appearance

[importnil]

I would take the right to propose this tiny cosmetic bit since I've used to design things a lot in past.

This lowers the status font-size, adjusts vertical paddings and changes some background colors for status messages to become more saturated and compound with other colors.

It's really more compact and clean as well :)

[riannucci]

Would you be able to attach before/after images?