body {
    margin: 0;
    font-family: 'Roboto', sans-serif; 
    letter-spacing: 1px;
    line-height: 1.5;
    list-style: none;  
}

.social li{
    display: grid;
    place-content: center;
    place-items: center;
    text-align: center;
    margin-left: auto;
    margin-bottom: 10px;
    display: inline-block;
    padding: 5px;
}

.social-item {
    filter: opacity(60%);
    padding: 5px;
    width: 20px;
    left: 10px;
}

.social-item:hover{
    filter: opacity(100%);
    transition: 0.3s all;
}
 
.closebtn {
    float: right;
    width: 20px;
    display: block;
    margin-right: 15px;
}

h1,h2{
    text-align: center;
}

.presentation p{
    text-align: center;
    justify-content: center;
    text-align: justify;
    margin-left: 15vw;
    margin-right: 15vw;
    font-size: small;
}

/* ---- lighted shadow effect, cf Muhammed Erdem's work ---- */

.gallery {
    margin-top: 5vw;
    display: grid;
    grid-template-columns: repeat (3, 1fr);
    gap: 10px;
    height: auto;
    padding-bottom: 10px;
}

.row{
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.row img{
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.row img.horizontal{
    grid-column: span 2;
}

/* line-height: 0;
    -webkit-column-count: 3;
    -webkit-column-gap:10px;
    -moz-column-count: 3;
    -moz-column-gap: 10px;
    column-count: 3;
    column-gap: 10px; 
}
#gallery img {
    width: 100%;
    height: auto;
    margin-bottom: 5px;
    transition: 0.3s;
    display: block;
    object-fit: cover;

}

#gallery img.vertical{
    aspect-ratio: 1/3;
    grid-column: span 1;
}

#gallery img.horizontal{
    aspect-ratio: 4/3;
    grid-column: span 2;
}

@media screen and (max-width:935px) {
.row{
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}
.row img.horizontal{
    grid-column: span 2;
}
}*/

@media screen and (max-width:600px) {
.row{
    grid-template-columns: 1fr;
}
.row img.horizontal{
    grid-column: span 1;
}

}