.feedback__button-lk.loading {
    position: relative;
    color: transparent !important;
}
.feedback__button-lk.loading::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    width: 1em;
    height: 1em;
    margin: -0.5em 0 0 -0.5em;
    border: 2px solid #fff;
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}