body, * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

main {
    padding: 50px 20px 20px 20px;
}

h1 {
    text-align: center;
}

@media screen and (min-width: 900px) {
    main {
        padding: 135px 20px 20px 20px;
    }
}