body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background: #f9f9f9
}

.gg-box {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    grid-auto-rows: 200px;
    grid-gap: 4px
}

.gg-box img {
    object-fit: cover;
    cursor: pointer;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.02);
    border-radius: 3px;
    transition: 0.3s;
}

.gg-box img:hover {
    opacity: .7;    
}

#gg-screen {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    background: rgba(255, 255, 255, 0.85);
    z-index: 9999;
    text-align: center
}

#gg-screen .gg-image {
    height: 100%;
    display: inline-flex;
    justify-content: center;
    align-items: center
}

#gg-screen .gg-image img {
    max-width: 100%;
    max-height: 100%;
    margin: 0 auto
}

.gg-bt {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.6);
    color: #222;
    text-align: center;
    line-height: 47px;
    vertical-align: middle;
    cursor: pointer;
    -moz-transition: all .4s ease;
    -o-transition: all .4s ease;
    -webkit-transition: all .4s ease;
    transition: all .4s ease;
    font-size: 25px;
    border: 1px solid rgba(0, 0, 0, 0.05);
    box-sizing: border-box;
    padding-left: 2px;
    position: fixed;
    bottom: 10px
}

.gg-bt:hover {
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(0, 0, 0, 0.5)
}

.gg-close {
    top: 10px
}

.gg-close,
.gg-next {
    right: 10px
}

.gg-prev {
    right: 61px
}

.gg-prev,
.gg-next {
    bottom: 10px
}

@media(min-width:478px) {
    .gg-box img:nth-child(3n+0) {
        grid-row-end: span 2
    }
}

@media(max-width:768px) {
    .gg-box {
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
        grid-auto-rows: 150px;
        grid-gap: 6px
    }
}