body {
    margin: 0;
    padding: 0;
  
}

.gallery {
        margin-top: 10px;
    background: antiquewhite; 
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    flex-wrap: wrap;
   
}

.gallery img {
    width: 280px;
    height: 260px;
    margin: 10px auto;
}
/*********************** @media ***************************/
@media screen and (max-width: 768px) {
    .gallery {
        margin-top: 10px;
    }
    .gallery img {
        display: flex;
        flex-direction: column;
        justify-content: center;
        margin: 20px auto;
    }
}