.ambassadors-header img {
    -webkit-filter: grayscale(100%);
    /* Chrome, Safari, Opera */
    filter: grayscale(100%);
}

.ambassadors-header img:hover {
    -webkit-filter: grayscale(0%);
    /* Chrome, Safari, Opera */
    filter: grayscale(0%);
}

.block-image {
    -webkit-filter: grayscale(100%);
    /* Chrome, Safari, Opera */
    filter: grayscale(100%);
}

.block:hover .block-image {
    -webkit-filter: grayscale(0%);
    /* Chrome, Safari, Opera */
    filter: grayscale(0%);
}

@media (max-width: 992px) {
    * {
        -webkit-filter: grayscale(0%)!important;
        /* Chrome, Safari, Opera */
        filter: grayscale(0%)!important;
    }
}