body{margin:0;padding:0;display:flex;align-items:center;justify-content:center;height:100vh}.playfield{width:21rem;height:21rem;background-color:#000;border:2px solid black;flex-wrap:wrap;display:flex}.reset-btn{margin-top:3rem}.square{box-sizing:border-box;width:7rem;height:7em;background-color:#fff;border:2px solid black;color:#000;display:flex;align-items:center;justify-content:center}.circle{width:4rem;height:4rem;border-radius:50%;border:.8rem solid blue}.cross{width:5rem;height:5rem;position:relative;transform:rotate(45deg)}.cross:before,.cross:after{content:"";position:absolute;background-color:red}.cross:before{left:50%;width:30%;height:100%;margin-left:-15%}.cross:after{top:50%;width:100%;height:30%;margin-top:-15%}:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-text-size-adjust:100%}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media (prefers-color-scheme: light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}