Skeleton Loader CSS

skeleton.css

/* The loading Class */
.loading {
    position: relative;
    background-color: #e2e2e2;
}

/* The moving element */
.loading::after {
    display: block;
    content: "";
    position: absolute;
    width: 100%;
    height: 100%;
    transform: translateX(-100%);
    background: -webkit-gradient(linear, left top,
                right top, from(transparent),
                color-stop(rgba(255, 255, 255, 0.2)),
                to(transparent));

    background: linear-gradient(90deg, transparent,
            rgba(255, 255, 255, 0.2), transparent);

    /* Adding animation */
    animation: loading 0.8s infinite;
}

/* Loading Animation */
@keyframes loading {
    100% {
        transform: translateX(100%);
    }
}