section.pictures{
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;

    @media(min-width:425px){
        
        grid-template-columns: repeat(4, 1fr);
        grid-template-rows: 1fr;

        picture img{
            width: 100%;
        }
        
    }
}