This is a little script randomizing what picture should it display. I can easily set this to an <img> using document.getElementById("pic").src = randPics[randNumGen], but the background tag requires me to use url(). How can I set document.body.style.background to "url(and the random image here)"? Please no JS libraries.
const randPics = ["https://i.ibb.co/6JBbMYm/pic1.jpg", "https://i.ibb.co/rHjTdfc/pic2.jpg"];
window.onload = choosePicture();
function choosePicture() {
let randNumGen = Math.floor(Math.random() * randPics.length);
console.log(randNumGen);
document.body.style.background = "randPics[randNumGen]";
}<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="styles.css">
<script async src="index.js" type="text/javascript"></script>
</head>
<body>
<img width="500px" src="#" alt="pic" id="pic">
</body>
</html>var url = randPics[randNumGen];
document.body.style.backgroundImage = "url('"+ url + "')";