*{margin:0;padding:0;box-sizing:border-box;text-decoration:none;list-style:none}.App{padding:1rem 5rem;height:100vh;text-align:center}.board{margin:0 auto;width:550px;display:grid;grid-template-columns:repeat(8,1fr);row-gap:0}.block{width:70px;height:70px;border:1px solid black;cursor:pointer}.white{background-color:#fff}.black{background-color:#000}.highlighted{background-color:red}