body {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    font-family: Arial, sans-serif;
    background: #eee;
}

h1 {
    text-align: center;
    margin-bottom: 20px;
}

#board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0px;
    margin-bottom: 20px;
}

.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    border: 2px solid #000;
}

.grid input {
    width: 50px;
    height: 50px;
    font-size: 20px;
    text-align: center;
    border: 1px solid #000;
}

button {
    margin-right: 10px;
    padding: 10px 20px;
    border: none;
    background: #007BFF;
    color: #fff;
    cursor: pointer;
}

button:hover {
    background: #0056b3;
}

button:last-child {
    margin-right: 0;
}