.image-placeholder {
    position: relative;
    display: block;
    background-color: #f0f0f0;
    min-height: 150px;
}
.image-placeholder .image-mask {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #000000;
    opacity: 0.3;
}
.image-placeholder .image-mask .loading {
    display: block;
    position: absolute;
    width: 80px;
    height: 80px;
    text-align: center;
    left: 50%;
    margin-left: -40px;
    top: 50%;
    margin-top: -40px;
}
.image-placeholder .image-mask .loading {
    color: #fff;
    font-size: 50px;
    font-style: normal;
    line-height: 68px;
}
.image-placeholder .image-mask .loading .ring {
    display: inline-block;
    width: 80px;
    height: 80px;
}
.image-placeholder .image-mask .loading .ring:after {
    content: " ";
    display: block;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    border: 6px solid #fff;
    border-color: #fff transparent #fff transparent;
    animation: loading-ring 1.2s linear infinite;
}
@keyframes loading-ring {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}