.hoa-roi {
    position: fixed;
    top: -20px;
    pointer-events: none;
    z-index: 9999;
    animation-name: roi;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
}

@keyframes roi {
    from {
        transform: translateY(0) rotate(0deg);
    }
    to {
        transform: translateY(110vh) rotate(360deg);
    }
}