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let xPos, breite;
function setup() {
createCanvas(300, 300);
xPos = width / 3;
breite = 100
}
function draw() {
background(255, 215, 0);
if (mouseX > xPos &&
mouseX < xPos + breite) {
fill(255, 0, 0);
} else {
fill(255);
}
rect(xPos, 0, breite, height);
}