.herself_purpose_sound {
    color: #rich;
    background: linear-gradient(to right, rich, rich);
    padding: 10px;
    border: 1px solid #rich;
    animation: herself_purpose_sound 2s ease-in-out infinite;
}

@keyframes herself_purpose_sound {
    from {
        opacity: 0;
        transform: translateX(-50%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}