onec.me/themes/beautifulhugo/static/css/hugo-easy-gallery.css

/*
Put this file in /static/css/hugo-easy-gallery.css
Documentation and licence at https://github.com/liwenyip/hugo-easy-gallery/
*/


/*
Grid Layout Styles
*/
.gallery {
    overflow: hidden;
    margin: 10px;
    max-width: 768px;
}
.gallery .box {
    float: left;
    position: relative;
    /* Default: 1 tile wide */
    width: 100%;
    padding-bottom: 100%; 
}
@media only screen and (min-width : 365px) {
    /* Tablet view: 2 tiles */
    .gallery .box {
        width: 50%;
        padding-bottom: 50%;
    }
}
@media only screen and (min-width : 480px) {
    /* Small desktop / ipad view: 3 tiles */
    .gallery .box {
        width: 33.3%;
        padding-bottom: 33.3%; /*  */
    }
}
@media only screen and (min-width : 9999px) {
   /* Medium desktop: 4 tiles */
   .box {
      width: 25%;
      padding-bottom: 25%;
   }
}

/*
Transition styles
*/
.gallery.hover-transition figure,
.gallery.hover-effect-zoom .img, 
.gallery:not(.caption-effect-appear) figcaption,
.fancy-figure:not(.caption-effect-appear) figcaption {
    -webkit-transition: all 0.3s ease-in-out;
    -moz-transition: all 0.3s ease-in-out;
    -o-transition: all 0.3s ease-in-out;
    transition: all 0.3s ease-in-out;
}
/*
figure styles
*/
figure {
    position:relative; /* purely to allow absolution positioning of figcaption */
    overflow: hidden;
}
.gallery figure {
    position: absolute;
    left: 5px;
    right: 5px;
    top: 5px;
    bottom: 5px;
}
.gallery.hover-effect-grow figure:hover {
    transform: scale(1.05);
}
.gallery.hover-effect-shrink figure:hover {
    transform: scale(0.95);
}
.gallery.hover-effect-slidedown figure:hover {
    transform: translateY(5px);
}
.gallery.hover-effect-slideup figure:hover {
    transform: translateY(-5px);
}

/*
img / a styles
*/

.gallery .img {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    background-size: cover;
    background-position: 50% 50%;
    background-repeat: no-repeat;
}
.gallery.hover-effect-zoom figure:hover .img {
    transform: scale(1.05);
}
.gallery img {
    display: none; /* only show the img if not inside a gallery */
}
figure a {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
}

/*
figcaption styles
*/
.gallery figcaption,
.fancy-figure figcaption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: #000;
    color: #FFF;
    text-align: center;
    font-size: 75%; /* change this if you want bigger text */
    background: rgba(0, 0, 0, 0.5);
    opacity: 1;
    cursor: pointer;
}
.gallery.caption-position-none figcaption,
.fancy-figure.caption-position-none figcaption  {
    display: none;
}
.gallery.caption-position-center figcaption,
.fancy-figure.caption-position-center figcaption {
    top: 0;
    padding: 40% 5px;
}
.gallery.caption-position-bottom figcaption,
.fancy-figure.caption-position-bottom figcaption {
    padding: 5px;
}
.gallery.caption-effect-fade figure:not(:hover) figcaption,
.gallery.caption-effect-appear figure:not(:hover) figcaption,
.fancy-figure.caption-effect-fade figure:not(:hover) figcaption,
.fancy-figure.caption-effect-appear figure:not(:hover) figcaption {
    background: rgba(0, 0, 0, 0);
    opacity: 0;
}
.gallery.caption-effect-slide.caption-position-bottom figure:not(:hover) figcaption,
.fancy-figure.caption-effect-slide.caption-position-bottom figure:not(:hover) figcaption {
    margin-bottom: -100%;
}
.gallery.caption-effect-slide.caption-position-center figure:not(:hover) figcaption,
.fancy-figure.caption-effect-slide.caption-position-center figure:not(:hover) figcaption  {
    top: 100%;
}
figcaption p {
    margin: auto; /* override style in theme */
}