body{
background:#0d1117;
color:white;
font-family:sans-serif;
text-align:center;
margin:0;
}

h1{
padding:20px;
}

.gallery{
column-count:4;
column-gap:12px;
padding:20px;
}

.gallery img{
width:100%;
margin-bottom:12px;
border-radius:10px;
cursor:pointer;
transition:0.25s;
break-inside:avoid;
}

.gallery img:hover{
transform:scale(1.04);
}

@media(max-width:1000px){
.gallery{column-count:3;}
}

@media(max-width:700px){
.gallery{column-count:2;}
}

/* popup */

#lightbox{
position:fixed;
top:0;
left:0;
width:100%;
height:100%;
background:rgba(0,0,0,0.95);
display:none;
align-items:center;
justify-content:center;
flex-direction:column;
z-index:999;
}

#lightbox img{
max-width:90%;
max-height:80%;
border-radius:10px;
}

#prev,#next{
position:absolute;
top:50%;
transform:translateY(-50%);
background:none;
border:none;
font-size:60px;
color:white;
cursor:pointer;
}

#prev{left:20px;}
#next{right:20px;}

#download{
margin-top:20px;
background:#238636;
padding:10px 20px;
border-radius:8px;
text-decoration:none;
color:white;
}