.no-padding-mail{
    padding: 0px;
}

@media (min-width: 768px) {
    .firstname-class {
        padding-right: 16px !important; !important; /* Еквивалент на pr-1 */
    }
    .lastname-class {
        padding-right: 16px !important; !important; /* Еквивалент на pr-1 */
    }
}