.navbutton{background-color:#3b82f6;color:#f1f5f9}.navbutton:hover{background-color:#60a5fa}#body{display:flex;flex-direction:column;align-items:center;justify-content:flex-start;min-height:100vh;background:linear-gradient(to right,#334155,#1e293b);font-family:Arial,sans-serif;min-width:100vw}#header{text-align:center;margin-bottom:40px;margin-top:100px}#header h1{font-size:36px;color:#fff;margin:0}#card{width:100%;max-width:500px;background-color:#fff;padding:10px 20px;border-radius:12px;box-shadow:0 6px 18px #0000001a;text-align:center;margin-top:15px}#card h2{margin-bottom:20px;color:#048;font-size:24px}#board{display:grid;grid-template-columns:repeat(3,200px);grid-template-rows:repeat(3,200px);gap:5px;width:630px;margin:20px auto;border:5px solid black}.cell{width:200px;height:200px;background-color:#fff;display:flex;justify-content:center;align-items:center;font-size:2em;cursor:pointer;border:2px solid black}:root{font-family: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}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}}