+ 3
Three elements are used after # as shorthand where each element is doubled.
e.g
#123 = #112233
#000 = #000000
#fff = #ffffff
+ 1
It's a common shortcut for colors with all the same characters
# introduces the color hexadecimal and three characters are compiled as six...
#FFFFFF is white
+ 1
rgb(256,256,256) is The last possible values ââare for coloring,
and in hexadecimal value last value is f
#fff=#ffffff is white because its last of value.