title: Matter.js change colors
body: <p>I'm working with matter.js on a small project.</p>
  
  <p>I'm tryin to change the background color of the canvas and add custom colors to objects.</p>
  
  <p>Does anyone know a tutorial or something for styling matter.js</p>
  
  <p><a href="http://brm.io/matter-js-demo/#newtonsCradle">Matter.js</a></p>