@media only screen and (max-width: 1199px) {
    .btn {
        font-size: 1.2rem;
    }

}

@media only screen and (max-width: 991px) {
    .btn {
        font-size: 1rem;
        padding: 5px 10px;
        display: block;
        margin: auto;
        transition: 250ms;
    }

}