body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    line-height: 1.6;
}

header {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1em;
}

section {
    padding: 80px;
    max-width: 800px;
    margin: 0 auto;
}


@media screen and (max-width: 600px) {
    header {
        font-size: 14px;
    }

    section {
        padding: 25px;
    }
}