body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f4f4f4;
    color: #333;
}

header {
    background: #0078d7;
    color: white;
    text-align: center;
    padding: 40px 20px;
}

main {
    display: flex;
    justify-content: center;
    padding: 40px 20px;
}

.card {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    max-width: 500px;
}

button {
    background: #0078d7;
    color: white;
    border: none;
    padding: 10px 16px;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    opacity: 0.9;
}

footer {
    text-align: center;
    padding: 20px;
}