#content {
    height: 2000px;
    border: thin solid black;
    padding-left: 20px;
    padding-top: 150px;
    font-size: 22pt;
}
.hide {
    opacity: 0;
}
.show {
    animation: fadein 14s;
}

@keyframes fadein {
    from { opacity: 0; }
    to   { opacity: 1; }
}