How to make many elements (div) wrap around one specific element (div) in html/css/js?

This is what I have right now:
my attempt

As you can see, the circles go under the big blue rectangle. But I want them to wrap around. I would look something like this:
implementation in paint3d

The rectangle has to be in the center. And notice the indexing, it would be good if it kept increasing from left-to-right, top-to-bottom

This is my code:

HTML

<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="style.css">
    <script defer src="code.js"></script>
    <title>1440 Minutes wallpaper</title>
</head>
<body>
    <div id='flexbox'>
        <div id="info">big block</div>
        <div id="balls"></div>
    </div>
</body>
</html>

CSS

body {

    margin: 0px;
}
#flexbox {
    
    width: 2560px;
    height: 1440px;
}
#balls {

    width: 2520px;
    height: 960px;

    display: flex;
    flex-wrap: wrap;

}
#info {

    width: 560px;
    height: 440px;

    font-size: 50px;
    color: white;
    background-color: rgb(0,0,255,0.5);

    top: 500px;
    left: 1000px;

    position:absolute;
}
.MinuteBall {

    background-color: gray;

    width: 40px;
    height: 40px;
    margin: 1px;
    border-radius: 50%;
}

JS

document.body.onload = InitiateWallpaper;

function InitiateWallpaper() {

    for (let i = 0; i < 1440; i++) {

        const newDiv = document.createElement("div");
        newDiv.classList.add("MinuteBall");
        const text = document.createTextNode(i);
        newDiv.appendChild(text);

        const currentDiv = document.getElementById("balls");
        currentDiv.appendChild(newDiv);
    }
}

I am doing this thing only for myself, at least for now, so I am not interested and worried about supporting different screen sizes or browsers and stuff like that. Just Firefox and a 2560×1440 screen.

All the sizes that exist are experimental and don’t really matter as much as the wrap-around thing.

I am new to the web stuff and would appreciate your help a lot!