<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.3.1/p5.min.js"></script>

body {
  margin: 0;
  overflow: hidden;
}

function setup() {
  createCanvas(windowWidth, windowHeight)
  background('#fbf8f3')
}

function draw() {
  if (mouseIsPressed) {
    pen()
  }
}

function pen() {
	// set the color and weight of the stroke 
	stroke(0, 0, 0, 255)
	strokeWeight(2)
  
	// draw a line from current mouse point to previous mouse point
  line(mouseX, mouseY, pmouseX, pmouseY)
}