index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="style.css" />
    <title>Document</title>
  </head>
  <body>
    <h3>Pixel arte de Jesus feito com</h3>
    <h3>CSS grid e JavaScript!</h3>
    <div class="wrapper" id="pixels"></div>
  </body>
  <script>
    function criarElementos() {
        let contador = 1
        for (let i = 0; i < 4910; i++) {
            let divMae = document.getElementById("pixels");
            var divNova = document.createElement("div");
            divNova.setAttribute("class", "box" + contador)
            divNova.setAttribute("id", "box")
            var conteudoNovo = document.createTextNode('');
            divNova.appendChild(conteudoNovo);
            divMae.appendChild(divNova);
            console.log(contador)
            contador++
        }
    }
    function criarPixel() {
      let divMae = document.getElementById("pixels");
      console.log(divMae);
    }
    criarPixel();
    criarElementos()
  </script>
</html>