#extra_icon {
    position: absolute;
    top: 80%;
    left: -10%;
    transform: translate(-50%, -50%);
    display: none;
    animation: move-vertical 2s ease-in-out infinite, move-horizontal 2s ease-in-out infinite;
}

@keyframes move-vertical {
    0% {
        transform: translateY(0) rotate(30deg);
    }
    25% {
        transform: translateY(-300%) rotate(390deg);
    }
    50% {
        transform: translateY(-90%) rotate(750deg);
    }
    75% {
        transform: translateY(-900%) rotate(120deg);
    }
    100% {
        transform: translateY(-950%) rotate(240deg);
    }
}

@keyframes move-horizontal {
    0% {
        left: -5%;
    }
    50% {
        left: 55%;
    }
    100% {
        left: 120%;
    }
}