1.*{margin: 0;padding: 0;}


html{}

@media screen and (min-width: 900px) {
    body{
        max-width: 800px;
        margin: 10px auto;
    }
}

@media screen and (max-width: 900px) {
    body{
        max-width: 90%;
        margin: 10px 5%;
    }
}