.galerie-lightbox{
position:fixed;
inset:0;
background:rgba(0,0,0,.9);
display:flex;
align-items:center;
justify-content:center;
z-index:9999;
}

.galerie-lightbox img{
max-width:85%;
max-height:85%;
}

.galerie-lightbox .nav{
position:absolute;
top:50%;
transform:translateY(-50%);
cursor:pointer;
}

.galerie-lightbox .prev{left:30px;}
.galerie-lightbox .next{right:30px;}