body {
    font-family: Arial, sans-serif;
    padding: 20px;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 20px;
}

table {
    width: 320px;
    height: 330px;
    margin: 0 auto;
    border-collapse: collapse;
    user-select: none;
    cursor: pointer;
}

table tr:first-child {
    background-color: blue;
    color: white;
    font-weight: bold;
}

table td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: center;
}