body {
    font-family: sans-serif;
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    background-color: #f0f0f0;
}

header {
    padding: 20px;
    background-color: #333;
    color: white;
    width: 100%;
    text-align: center;
}

main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

footer {
    padding: 20px;
    background-color: #333;
    color: white;
    width: 100%;
    text-align: center;
}