shoopik,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
div.block {
height: 50px;
width: 50px;
background-color: #FFFF00;
margin: 2px;
}
#game{
display: flex;
background-color: #0000FF;
width: 162px;
}
</style>
</head>
<body>
<div id="game"></div>
<script>
function pole(rows, cols, el) {
el = document.getElementById(el)
for (; rows--;) {
var div = document.createElement("div");
for (var j=0; j<cols; j++) {
var d = div.cloneNode();
d.classList.add("block");
div.appendChild(d);
};
el.appendChild(div)
};
};
pole(3, 3, "game")
</script>
</body>
</html>