body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
header {
    background-color: #efefef;
    padding: 1rem;
    text-align: center;
}
main {
    flex: 1;
    padding: 2rem;
    text-align: center;
}
footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 1rem;
}
@media (max-width: 600px) {
    main {
        padding: 1rem;
    }
}