body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f2f2f2;
}

header {
    background-color: #0078d4;
    color: #fff;
    text-align: center;
    padding: 20px;
}

.main h1, .main p {
    margin: 0;
}

.birthday {
    font-size: 1.5em;
    font-weight: bold;
    margin-top: 5px;
}

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.invitation, .contact {
    background-color: #fff;
    margin-bottom: 20px;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

.invitation h2, .contact h2 {
    font-size: 1.5em;
}

footer {
    text-align: center;
    background-color: #0078d4;
    color: #fff;
    padding: 10px;
}

a {
    color: #0078d4;
    text-decoration: none;
}