.wpio-lazy {
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
}

.wpio-lazy.wpio-loaded {
    opacity: 1;
}

.wpio-lazy:not(.wpio-loaded) {
    background-color: #f5f5f5;
    min-height: 100px;
}

.wpio-loaded {
    animation: wpio-fade-in 0.3s ease-in-out;
}

@keyframes wpio-fade-in {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}