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let diameter;
function setup() {
createCanvas(windowWidth, windowHeight);
diameter = width / 100.0;
}
function draw() {
background(63);
noStroke();
fill(31, 127, 255);
circle(width / 2, height / 2, diameter);
diameter = diameter * 1.05;
if (diameter > width * 1.5) {
diameter = width / 100.0;
}
}