Use of `background` property to set background color clobbers other background properties about infima

[lex111]

Sorry for the delay, apparently it would have been better to fix it for this particular case for now, if you still want to do it, please let me know about it.

[reefdog]

@lex111 Happy to! Will issue a PR shortly.

[reefdog]

@lex111 Since this issue will affect other elements too, do you think it's worth keeping open until all instances are resolved?

[lex111]

I would keep this issue closed, but instead fixing each specific case if it arises. Although I understand that in general it's wrong to use background property for background color only, but it's a kind of micro-optimization.