body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    text-align: center;
    background-color: #C1FF00;
}
header {
    background: #333;
    color: white;
    padding: 10px;
}
footer {
    margin-top: 20px;
    padding: 10px;
    background: #333;
    color: white;
}
.content {
    display: block;
    height: 100vh;
    text-align: center;
}