Floaty bubbles Matter.js setup

file.js

// engine
this.engine = Matter.Engine.create();
this.engine.world.gravity.y = 0;

// render
this.render = Matter.Render.create({
    canvas: document.querySelector(this.options.canvasSelector),
    engine: this.engine,
    options: {
        width: viewportWidth,
        height: viewportHeight,
        wireframes: false,
        background: 'transparent'
    }
});
Matter.Render.run(this.render);

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