:root{--board-size: 75vh}body{margin:0;width:100%;height:100vh}#root{height:100%;display:flex;justify-content:center;align-items:center}.board{box-sizing:border-box;border:4px solid black;width:var(--board-size);height:var(--board-size);display:flex;flex-wrap:wrap}.square{width:100%;height:100%;display:flex;justify-content:center;align-items:center}.piece{background-color:transparent;width:90%;height:90%}.piece:hover{cursor:default}.highlight{position:absolute;top:0;left:0;height:100%;width:100%;z-index:1;opacity:.5}dialog::backdrop{background-color:#000;opacity:.5}