blog_theme/assets/css/misc/utilities.css

.u-shadow {
    overflow: hidden;
    border-radius: 8px;
    box-shadow: var(--shadow-base);
    transition: box-shadow 0.3s var(--animation-base);
}

.u-shadow:hover {
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.12);
}

.u-placeholder {
    position: relative;
    z-index: 10;
    background-color: var(--light-gray-color);
}

.u-placeholder.same-height {
    height: 0;
}

.u-placeholder.rectangle {
    padding-bottom: 56.25%;
}

.u-object-fit {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.u-permalink {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 10;
    outline: none;
}