body{margin:0}.board{margin:0 auto;height:100vh;display:flex;flex-direction:column}.row{display:flex;flex:1}.checker{flex:1;text-align:center;display:flex;align-items:center;justify-content:center}.checker.dark{background-color:#000;color:#fff}.checker.light{background-color:#fff;color:#000}.fa{font-size:7.5vh;padding:20px}