Make a webpage with a background has at least 5 colors,
and in the middle there is 3 circles on top of each other with different sizes,
"biggest => Red"
"mid => Green"
"small => Blue".
On hover at any of those circles, shift the colors, "biggest => Blue" "mid => Red" "small => Green"
and the size of all of them gets slightly bigger. Now on click shift the colors more "biggest => Green" "mid => blue" "small => Red" and the background color becomes black from center to the outline in a circled shape ongoing. if clicked again -toggle- the screen outgoing the black circled shape to get back to the normal colors with the onclick effect.