.challenge-card {
    width: calc(33.33% - 32px);
}

@media screen and (max-width: 1024px) {
    .challenge-card {
        width: calc(50% - 32px);
    }
}

@media screen and (max-width: 576px) {
    .challenge-card  {
        width: calc(100% - 32px);
        max-width: 100%;
    }

    .challenge-card__img {
        width: 100%;
    }
}