.wrapper {
    padding: 35px 30px;
}

.btn.btn-principal {
    min-width: 100%
}

@media only screen and (min-width: 768px) { /* large */
    .wrapper {
        padding-top: 50px;
        padding-left: 177px;
    }

    .btn.btn-principal {
        min-width: 304px;
        width: 304px;
    }
}