css/grid.css

.gallery,
.duo-gallery {
    display: flex;
    flex-wrap: wrap;
    align-content: space-around;
    justify-content: space-around;
    max-width: 1200px;
    padding: 10px;
}


.duo-gallery .left {
    width: 40%;
}

.duo-gallery .left img {
    width: 100%;
    height: auto;
}

.duo-gallery .right {
    width: 60%;
    display: flex;
    flex-wrap: wrap;
    align-content: space-around;
    justify-content: space-around;
    padding: 5px;
}

.duo-gallery .right .gallery-container-img {
    width: 20%;
}

.right .gallery-container-img {
    width: 19%;
}

.gallery-container-img {
    transition: all 0.2s ease-in-out;
}

.concept-block {
    max-width: 500px;
}

.feature-viz-intro {
    max-width: 1000px;
    margin: auto;
}

.feature-viz-intro .gallery-container-img:hover {
    transform: scale(1.2);
    box-shadow: 0 0 12px currentColor;
    background-color: var(--md-default-bg-color);
}

.feature-viz-intro .gallery-container-img {
    width: 49%;
    max-width: 250px;
    border: solid 3px transparent;
    border-radius: 5%;
    margin: 3px;
    position: relative;
    cursor: pointer;
    box-shadow: 0 0 0px transparent;
    transition: all 0.2s ease-in-out;
}

.feature-viz-intro .gallery-container-img.four-columns {
    width: 24%;
}

.feature-viz-intro .gallery-container-img:hover {
    z-index: 10;
}

.feature-viz-intro .gallery-container-img span {
    position: absolute;
    padding: 5px;
    font-weight: bold;
}

/*
.feature-viz-intro .gallery-container-img.important {
    border-color: var(--primary);
}

span.important {
    color: var(--primary);
}
*/

.feature-viz-intro img {
    width: 100%;
    height: auto;
    transform: scale(1.01);
    transition: all 0.2s ease-in-out;
}

.feature-viz-intro .gallery-container-img:hover img {
    transform: scale(1.2);
}

.hidden-images {
    --size: 80px;
}

.hidden-images img {
    position: absolute;
    top: calc(50% - var(--size) / 2);
    left: calc(50% - var(--size) / 2);
    width: var(--size);
    transition: all 0.25s ease-in-out;
    opacity: 0;
    z-index: 1000;
    transform: translate(0px, 0px);
    border-radius: 10px;
}

summary span {
    font-size: 0.8rem
}