@media only screen and (max-width: 435px) {
    a.btn.btn-primary.btn-long-text {
        white-space: normal;
        padding: 10px 35px;
        line-height: 2.4;
        display: inline-table;
        font-size: 18px;
        font-size: 1.8rem;
    }
}

@media only screen and (max-width: 320px) {
    a.btn.btn-primary.btn-long-text {
        white-space: normal;
        padding: 10px 35px;
        line-height: 1.4;
        display: inline-table;
        font-size: 18px;
        font-size: 1.8rem;
    }
}