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

header {
    background-color: #333;
    color: #fff;
    padding: 20px;
    text-align: center;
}

main {
    max-width: 800px;
    margin: auto;
    padding: 40px;
}

table {
    border-collapse: collapse;
    width: 100%;
}

th, td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
}

th {
    background-color: #333;
    color: #fff;
}