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function setup(){
createCanvas(windowWidth, windowHeight);
}
function draw(){
background(160, 150, 190);
strokeWeight(20);
stroke(20, 150, 180);
line(0, 0, mouseX, mouseY);
line(width, 0, mouseX, mouseY);
line(0, height, mouseX, mouseY);
line(width, height, mouseX, mouseY);
}