form {
    height: inherit;
}

table {
    border-collapse: collapse;
    margin: 0 auto;
}

td {
    border: 1px solid #ccc;
    padding: 0;
}

input[type="text"] {
    width: 40px;
    height: 40px;
    text-align: center;
    font-size: 18px;
    border: 1px solid #ccc;
    
    outline: none;
}

.sudoku-cell {
    font-weight: bold;
    transition: background-color 0.2s ease;
}

.sudoku-cell:focus {
    background-color: #a4dac5;
}

/* Styling for 3x3 blocks */
table tr:nth-child(3n) td {
    border-bottom: 2px solid #000;
}

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

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

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

.container {
    max-width: 600px;
    width: 100%;
    background: #fff;
    padding: 20px;
    margin: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
}
.button-container {
        margin-top: 20px;
        text-align: center;
    }