var color = ".grey";
document.querySelector(color).addEventListener("click", setColor(color));

function setColor(color){
	var colorCode = "#000000";
	switch(color){
		case ".pink":
			colorCode = "#E91E63";
			break;
		case ".blue":
		  colorCode = "#2196F3";
		  break;
		case ".orange":
		  colorCode = "#9E9E9E";
		  break;
		case ".grey":
		  colorCode = "#9E9E9E";
		  break;
	}
	setStickerColor("sticker", "colorCode");
	setStickerColor("sticker2", "colorCode");
}

function setStickerColor(name, colorCode) {
  document.getElementById(name).style.backgroundColor = colorCode;
};