bluesky-bootstrap-theme/scss/components/_previews.scss

.previews-section {
    display: grid;
    grid-template-columns: auto auto auto;
    grid-template-rows: auto;
    grid-gap: 1.5rem;
    padding-bottom: 1.5rem;
}

.preview-container {
    width:100%
}

.card-preview {
    @include border-radius();
    width:100%;
    margin:auto;
    box-shadow: $large-shadow, $inset-shadow;
}

.preview-link:hover {
    text-decoration:none!important;
}

.preview-item {
    height:200px;
    overflow:hidden;
    font-size:0.9em;
    line-height: 1.5em !important;
    padding:0.2em;
    text-align:justify;
    background-color: get-color("light");
    color:rgba(0,0,0,0.4);
    position: relative;


    display: flex;
    -ms-flex-align: center !important;
    align-items: center !important;
    justify-content: center;
}

.preview-content {
    max-height:200px;
    & > p {
        width:100%;
        margin:auto;

        &.p-img {
            text-align:center;
            margin:auto;
            padding:auto;
            display: block;
            width:100%;
        }

        & > img {
            max-width:100%;
            height:auto;
            vertical-align:middle;
            margin:auto;
            text-align:center;
        }
    }

}

.preview-item h1, .preview-item h2, .preview-item h3, .preview-item h4, .preview-item h5, .preview-item h6, .preview-item h7 {
    margin-bottom:0px;
    max-width:100%;
    display:none;
}

.preview-item h1 {
    display:none;
}

.preview-overlay {
    height: 100%;
    width: 100%;
    opacity: 0;
    top: 0;
    left: 0;
    position: absolute;
    padding: 0;
    transition: opacity .5s;
    color: #FFF;
    background-color: rgba(0,0,0,0.5);
    text-shadow: 1px 1px 0px rgba(0,0,0,0.7);
    backdrop-filter: none;

    h1 {
        max-width:100%;
        padding-top:0.3em;
        margin:auto;
        margin-bottom:0px;
        text-align:center;
        display:block;
        font-size:2em;
        color: white;
    }
}

.preview-overlay h1,.preview-overlay h2,.preview-overlay h3,.preview-overlay h4,.preview-overlay h5,.preview-overlay h6,.preview-overlay h7,.preview-overlay h8,.preview-overlay h9,.preview-overlay h10  {
    color:white;
    text-shadow: 1px 1px 0px rgba(0,0,0,0.7);
}

.preview-item:hover .preview-overlay {
    opacity: .9;
    transition: opacity .5s;
    backdrop-filter: blur(2px);
}

.comment-text {
    margin-top:0.8em;
}

.card-preview time {
    margin-bottom:0.4em;
    display:block;
}