function setup() {
createCanvas(600, 120);
}
function draw() {
var redlight = 'white'
var yellowlight = 'white'
var greenlight = 'white'
background(220);
rectMode(CENTER);
fill(140)
rect(300,60,50,100)
if(mouseY>90){
greenlight='green'
}
else if(mouseY>55){
yellowlight = 'yellow'
}
else{
redlight='red'
}
fill(redlight)
ellipse(300,30,20,20)
fill(yellowlight)
ellipse(300,60,20,20)
fill(greenlight)
ellipse(300,90,20,20)
}