.auto-move {
    animation: floatMove 6s ease-in-out infinite alternate;
    display: inline-block;
}

@keyframes floatMove {
    0% {
        transform: translateY(0px) translateX(0px);
    }
    50% {
        transform: translateY(-30px) translateX(30px);
    }
    100% {
        transform: translateY(0px) translateX(0px);
    }
}