.spacer {
    height: 100px;
}
.spacer_l {
    height: 54px;
}
.spacer_s {
    height: 24px;
}
@media (max-width: 768px) {
    .spacer {
        height: calc(100px / 1.4);
    }
    .spacer_l {
        height: calc(54px / 1.4);
    }
}