Oscillator.js allows you to create multiple instances by passing an argument object.
let card1 = new Oscillator({ box: ".card1", color: "#befffe", direction: -1, frequency: 60});card1.start();
let card2 = new Oscillator({ box: ".card2", color: "#ffddbd", direction: 1});card2.start();
let card3 = new Oscillator({ box: ".card3", color: "#ead9ef", direction: -1, fps: 3});card3.start();