floating.css

.floating {
    animation-name: floating;
    animation-duration: 4s;
    animation-iteration-count: infinite;
    animation-timing-function: ease-in-out;
    margin-left: 30px;
    margin-top: 5px;
}

@keyframes floating {
    from {
        transform: translate(0, 0px);
    }
    65% {
        transform: translate(0, 15px);
    }
    to {
        transform: translate(0, -0px);
    }
}