body {
    background: #f9f9f9;
}

.gg-box {
    display: grid;
    grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
    grid-auto-rows:200px;
    grid-gap:8px;
}

.gg-element img {
    object-fit: cover;
    cursor: pointer;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
}

.gg-element img:hover {
    opacity: .90;
}

#gg-screen {
    position: fixed;
    margin-top: 100px;
    width: 100%;
    height: 100%;
    z-index: 1;
    top: 0;
    left: 0;
    
}

#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;
}