img {
    max-width: 90%;
}

.center {
    display: block;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.huge {
    text-align: center;
    font-size: 400%;
    font: fixed;
}

.big {
    font-size: 200%;
    font: fixed;
}