[@neon67 Participant 5 years, 8 months ago]

So, the final css looks like this (you must put “a”)

#bbpress-forums .bbp-topic-freshness .dayfresh  a {
background-color : #f4ffe8 ;
	border: 1px dashed;
	color: #475656;
}

also 86400 looks a lot – captures the 2nd day. Perhaps need to set 23 hours. But these are little things ))

Thanks to Robin for the great code!))
I think this is a useful find for those who visit the forum once a day and immediately see how many topics have been updated in the last day.
Colored blocks are very noticeable – it’s better than straining and peering at the date numbers.