.wb-category-skeleton {
    width: 120px;
    height: 120px;
    margin: 0 auto;
    border-radius: 10px;
    background: #eee;
    animation: pulse 1.2s infinite;
}

.wb-category-img {
    opacity: 0;
    transition: opacity .3s;
}

.wb-category-img-loaded {
    opacity: 1;
}

@keyframes pulse {
    0% { opacity: .6; }
    50% { opacity: 1; }
    100% { opacity: .6; }
}