example.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Usage</title>
    <style>
        html,
        body {
            width: 100vw;
            height: 100vh;
            margin: 0;
            display: grid;
            place-items: center;
        }

        div {
            height: min(70vh, 70vw);
            width: min(90vh, 90vh);
        }

        img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
    </style>
</head>

<body>
    <div>
        <img src="https://cdn.jsdelivr.net/gh/NacreousDawn596/dynamic-background@master/rose-pine-bg%402x.png" />
    </div>
    <script type="module">
        import { getGradientFromElement } from "https://cdn.jsdelivr.net/gh/NacreousDawn596/dynamic-background@master/main.js";
        const element = document.getElementsByTagName("img")[0];
        const gradient = await getGradientFromElement(element);
        console.log(gradient);
        document.body.style.background = gradient;
    </script>
</body>

</html>