@keyframes additionalMenuMove {
    0%, 100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-8px);
    }

    75% {
        transform: translateX(8px);
    }
}

.additional-menu-animated {
    display: inline-block;
    animation: additionalMenuMove 2.5s ease-in-out infinite;
}