body {
    align-items: center;
    align-content: center;
    text-align: center;
    font-family: Helvetica, sans-serif;
    font-size:larger;
    max-width: 90vw;
    padding-left: 5vw;
    padding-right: 5vw;
}

#banner {
    width:50vw;
}

@media (max-width:600px) {
    body {
        font-size: medium;
    }
    #banner {
        width:100%;
    }
}