.wp_gallery_advanced_img100 {
    width: 100%;
    height: auto;
    background-size: cover;
    background-position: center;
}
a.wp_gallery_advanced_gal_item_thumb {
    display: inline-block;
    width: 100%;
    position: relative;
}

.wp_gallery_advanced_flex {
    display: -webkit-box;
    display: -moz-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
}

.wp_gallery_advanced_thumbnails {
    flex-wrap: wrap;
}

a.wp_gallery_advanced_gal_item_thumb:hover:before {
    position: absolute;
    top: 0;
    left: 0;
    content: "";
    width: 100%;
    height: 100%;
    background: #000;
    opacity: 0.5;
}
a.wp_gallery_advanced_gal_item_thumb:hover:after {
    position: absolute;
    top: calc(50% - 20px);
    left: calc(50% - 20px);
    content: "\e914";
    font-family: 'icomoon' !important;
    speak: none;
    font-style: normal;
    font-weight: normal;
    font-variant: normal;
    text-transform: none;
    line-height: 1;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-size: 50px;
    color: #fff;
    opacity: 1;
}