body {
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
    text-align: center;
    padding: 20px;
}

h1 {
    color: #333;
}

table {
    margin: auto;
    border-collapse: collapse;
    background-color: white;
}

td, th {
    padding: 8px 15px;
    border: 1px solid #ccc;
}

th {
    background-color: #4CAF50;
    color: white;
}

input[type='text'], input[type='number'] {
    padding: 5px;
    margin: 5px;
}

input[type='submit'] {
    background-color: #4CAF50;
    color: white;
    padding: 7px 15px;
    border: none;
    cursor: pointer;
}