Help to find info please

HTML-CSS
#1

A few days ago seen bg color in div like #b1b1b1RF, main is that there was 8 symbols , not 6 and there was ability to set opacity in # color. Can’t find info about this css trick.

#2

Have you tried MDN? https://developer.mozilla.org/en-US/docs/Web/CSS/color_value

1 Like
#3

Thanx <3 Best!
It’s actually it

#4