.gallery{
    margin: 10px 10px;
}
.gallery img{
    transition:  1s;
    padding: 5px;
    width: 300px;
}
.gallery img:hover {
    filter: grayscale(100%);
    transform: scale(1.1);
}

@media only  screen and (max-width:769px){
    .container .gallery{
        display: flex;
        flex-direction: column;
        justify-content: space-between;
    }
    
}