Download the Gradient.js file and add in your project

HTML

 <canvas id="gradient-canvas" data-transition-in />

CSS

#gradient-canvas {
width: 100%;
height: 100%;
--gradient-color-1: #0051ff;
--gradient-color-2: #0099ff;
--gradient-color-3: #00c3ff;
--gradient-color-4: #af39e6;
}

JS

import { Gradient } from './Gradient.js'

// Create your instance
const gradient = new Gradient()

// Call initGradient with the selector to your canvas
gradient.initGradient('#gradient-canvas')