Matter.js setup

file.js

// engine
let engine = Matter.Engine.create();

// render
let render = Matter.Render.create({
    element: document.getElementById('container'),
    engine: engine,
    options: {
        width: SOME_WIDTH,
        height: SOME_HEIGHT,
        wireframes: false
    }
});
Matter.Render.run(render);

// runner
let runner = Matter.Runner.create();
Matter.Runner.run(runner, engine);

// now you can start adding bodies...