Browser Safe Color Value Chart
One easy way to figure out if you are using a Web safe color, it to use the following chart. You'll notice that all the RGB values are multiples of 51, which are in 20% increments from 0 to 255.
%
RGB
HEX
100
255
FF
80
204
CC
60
153
99
40
102
66
20
51
33
0
0
00
Next Demo: RGB to Hexidecimal Chart