.bilder_alt_button {

}

.bilder_alt_button.loading img {
    display: none;
}

.bilder_alt_button .loading {
    display: inline-block;
    position: relative;
    width: 16px;
}

.bilder_alt_button .loading:before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 10px;
    height: 10px;
    margin-top: -10px;
    border: 2px solid rgba(0, 0, 0, 0.2);
    border-top-color: #000;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}