html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    /*display: flex;*/
    /*justify-content: center;*/
    overflow: hidden;
}

body {
    max-width: 600px;
    margin: 0 auto;
}

@media (max-width: 800px) {
    body {
        max-width: none;
    }
}