.grid {
    display: grid;
    grid-template-columns: 1fr;
}
/* Стандартное значение */
@media (max-width: 575px) {
    
}

/* MIN width < 576 --- sm --- */
@media (min-width: 576px) {
    
}

/* MIN width < 768 --- md --- */
@media (min-width: 768px) {
    
}

/* MIN width < 992 --- lg --- */
@media (min-width: 992px) {
    .grid-cols-lg-3 {
        grid-template-columns: 1fr 1fr 1fr;
    }
}

/* MIN width < 1200 --- xl --- */
@media (min-width: 1200px) {
    
}