if you play around with changing your themes you will see its not a computer format thing. each theme has its colors, and icons.

example - black smart has a black theme and its icons for being on and off line are smile faces in yellow and red

responsive blue theme is blue and white and its on and off line icons are blue and gray

psych central theme is tan and blue and its icons are not dots more like outlines of a head and shoulder and its colors are green and red for online and off line

the spring theme is green and yellow and its on and off line icons are green and dark purplish blue.

tulip theme is pink and off white and its on and off line icons are green and blue

desert sand is dark sand colored and its on and off line icons are green and dark tan

black teal is black and teal colored and its icons for on and off line are the words off line and online not dots.

each theme you choose its a different colored theme and the icons for on and off line may look different.

everyone can choose their own themes in their profile settings or go to the bottom of the page and click on the themes they want.