colors.js

var reset = ["0"];
var resetGround = ["49"];

var frontColors = ["30", "1;30", "31", "1;31", "32", "1;32", "33", "1;33", "34", "1;34", "35", "1;35", "36", "1;36", "37", "1;37"];
var groundColors = ["", "40", "41", "42", "43", "44", "45", "46", "47"];

var cellContent = " cWy "

var spaceFill = function (caption, length) {
	while (caption.length < length) {
		caption = " " + caption;
	}

	return caption;
};

var buildEscape = function (attributes) {
	return "\u001b[" + attributes.filter(function (value) {
		return !!value;
	}).join(";") + "m";
};

var resultPrint = "\r\n" + " ".repeat(4);

groundColors.forEach(function (groundColor) {
	resultPrint += spaceFill(groundColor, cellContent.length + 1);
});

resultPrint += "\r\n";

frontColors.forEach(function (frontColor) {
	resultPrint += spaceFill(frontColor, 5) + " ";

	groundColors.forEach(function (groundColor) {
		resultPrint += buildEscape([frontColor, groundColor]) + cellContent;
		resultPrint += buildEscape(resetGround) + " ";
	});

	resultPrint += buildEscape(reset) + "\r\n";
});

console.log(resultPrint);