Random color gradient generator

A_Random_Gradient_Generator.js

import RGBAFader from "./RGBAFader.js";

var x = new RGBAFader();
var y = new RGBAFader();

var interval = setInterval( () => {
    y.accuate();
    x.accuate();

    var rgbX = "rgb(";
    for(var color of x.colors) {
        rgbX += color.color+",";
    }
    rgbX = rgbX.slice(0,rgbX.length-1) + ")";

    var rgbY = "rgb(";
    for(var color of y.colors) {
        rgbY += color.color+",";
    }
    rgbY = rgbY.slice(0,rgbY.length-1) + ")";

    var bg = "linear-gradient(to top, "+rgbX+" 0%, "+rgbY+" 100%)";
    document.body.style.background = bg;
}, 50);

Color.js

class Color {
    constructor(opts) {
        this.color = opts.color;
        this.options = Object.assign({},{
            "amount": 1,
            "increase": true,
            "bounds": {
                "high": 256,
                "low": 0
            }
        },opts);
    }

    change() {
        this.color += ((this.options.increase)?1:-1) * this.options.amount;
        return this.checkBounds();
    }

    checkBounds() {
        var opts = this.options, bounds = opts.bounds;
        if(this.color >= bounds.high) this.color -= opts.amount;
        else if(this.color <= bounds.low) this.color += opts.amount;
        else return this;
        this.options.increase = !opts.increase;
        return this;
    }
}

RGBAFader.js

import Color from "./Color.js";

class RGBAFader {
    constructor() {
        this.colors = [
            new Color(this.colorOpts()),
            new Color(this.colorOpts()),
            new Color(this.colorOpts())
        ];
    }

    accuate() {
        for(var color of this.colors) {
            color.change();
        }
    }

    colorOpts(){
        return {
            "amount": ~~(Math.random() * 3),
            "color": ~~(Math.random() * 255),
            "bounds": {
                "high": 255,
                "low": 0
            }
        };
    }
}