body {
        font-family: Arial, sans-serif;
        justify-content: center;
        margin-top: 50px;
}

button {
        border-radius: 5px;
        margin-top: 40px;
        font-size: 18px;  
}

table {
        margin-left: auto;
        margin-right: auto;
        border-collapse: collapse;
}

td {
        border: 1px solid #333;
        width: 40px;
        height: 40px;
        text-align: center;
}

input {
        width: 85%;
        height: 85%;
        text-align: center;
        font-size: 18px;
        border: none;
}

/* Linhas mais grossas para separar as 3x3 regiões */
td:nth-child(3n) {
        border-right: 2px solid #000;
}

tr:nth-child(3n) td {
        border-bottom: 2px solid #000;
}

td:first-child {
        border-left: 2px solid #000;
}

tr:first-child td {
        border-top: 2px solid #000;
}

h1 {
        text-align: center; 
}