SOURCE

var Engine=Matter.Engine,
        Render=Matter.Render,
        World=Matter.World,
        Mouse=Matter.Mouse,
        MouseConstraint=Matter.MouseConstraint,
        Composites=Matter.Composites,
        Bodies=Matter.Bodies;

    var engine=Engine.create(),
        world=engine.world;

    var vwidth = window.innerWidth, 
        vheight = window.innerHeight

    var render=Render.create({
       engine:engine,
       element:document.body,
       options:{
           width:vwidth,
           height:vheight,
           wireframes:false
       }
    });

    Engine.run(engine);
    Render.run(render);

    var rectA=Bodies.rectangle(100,20,200,40,{
        render:{
            fillStyle:"#f0c"
        }
    });
    var ground=Bodies.rectangle(vwidth/2,
    vheight-10,vwidth,20,{
        isStatic:true,
        render:{
            fillStyle:"#9fa"
        }
    });

    var stack_rect=Composites.stack(300,100,4,3,0,0,function(x,y){
        return Bodies.rectangle(x,y,150,40);
    });
    // var stack_circle=Composites.stack(600,100,5,5,2,3,function (x,y) {
    //     return Bodies.circle(x,y,30);
    // });

		var wall1 = Bodies.rectangle(0, 0, vwidth*2, 10, { isStatic: true });
		var wall2 = Bodies.rectangle(0, 0, 10, vheight*2, { isStatic: true });
    var wall3 = Bodies.rectangle(0, vheight*2, vwidth*2, 10, { isStatic: true });
    var wall4 = Bodies.rectangle(vwidth*2, 0, 10, vheight*2, { isStatic: true });

    var mouseConstraint=MouseConstraint.create(engine,{});

    World.add(world,[rectA,ground,stack_rect,mouseConstraint,wall1,wall2,wall3,wall4]);