body {
    font-family: 'Arial', sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

header {
    background-color: #333;
    color: #fff;
    padding: 10px;
    text-align: center;
}

main {
    padding: 20px;
}

footer {
    padding: 10px;
    text-align: center;
    border-top: #333 solid 1px;
}