css move animation

article {
    animation-name            : displaceContent;
    animation-duration        : 1s;
    animation-delay           : 4s;
    animation-iteration-count : 1;
    animation-fill-mode       : forwards;
}
@keyframes displaceContent {
    from { transform : translateY(0em) }
    to   { transform : translateY(3em) } /* slide down to make room for advertisements */
}