JSFiddle - React, Tailwind, and code Playground

HTML

<html>
    <body>
        <div id="field" class="field">
        </div>

        <style>
            .field {
                border: 2px solid #aaa;
                padding: 2px;
                display: inline-block;

                float: left;
            }

            .row {
                float: left;
                clear: both;
            }

            .cell {
                border: 1px solid #000;
                background-color: #00f;
                margin: 1px;
                width: 14px;
                height: 14px;

                float: left;
            }

            .cell.active {
                background-color: #0f0;
            }
        </style>

        <script
          src="https://code.jquery.com/jquery-3.2.1.min.js"
          integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4="
          crossorigin="anonymous"
        ></script>

        <script>
            var width = 10, height = 20;
            var x, y;

            // init html
            var $field = $('#field');
            var html;
            for (y = 0; y < height; y++) {
                html = '';
                html += '<div class="row">';
                for (x = 0; x < width; x++) {
                    html += '<div class="cell"></div>';
                }
                html += '</div>';
                $field.append(html);
            }


            // init field
            var field = [];
            for (y = 0; y < height; y++) {
                var row = [];
                for (x = 0; x < width; x++) {
                    row.push(0);
                }
                field.push(row);
            }
            console.log(field);

            field[0][4] = 1;
            field[1][4] = 1;
            field[2][4] = 1;
            field[3][4] = 1;


            // render field
            renderField(field);
            function renderField(field)
            {
                for (y = 0; y < field.length; y++) {
                    for (x =...