.grid{
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax((300px, 1fr)));
}

.grid-item img{
    max-width: 480px;
    max-height: 270px;
}

.different{
    grid-template-columns: repeat(auto-fill, minmax((300px, 1fr)));
}

.different img{
    max-width: 480px;
    max-height: 270px;
}