Some updates after Google's changes

[LingMan]

Google changed the layout again.

The first three commits fix some of the most annoying breakages, however I'm a CSS novice so feel free to re-do them however you like. The fourth commit fixes the colors of the 'managed by' header again.

hide 2018 xmas image fixes:

fix white corners on the privacy notice fixes:

fix color of the floating search form fixes:

I'll file proper bug reports if you missed anything after going through their changes.