body{color:#000;text-align:center;background-color:#fff;margin-top:30px;font-size:30px}#main{color:#fff;background-color:#000;width:400px;height:400px;margin-top:30px;margin-left:auto;margin-right:auto;font-size:200px;line-height:400px}.displayNone{display:none}#instructions{-webkit-user-select:none;user-select:none;color:#000;text-align:left;background-color:#fff;width:400px;height:400px;margin-top:30px;margin-left:auto;margin-right:auto;font-size:1rem;line-height:1.5rem}#start,#start:visited{color:#00f}