.btn-primary {
    color: #fff;
    background-color: #d73c00;
    border-color: #d73c00; /*set the color you want here*/
}

    .btn-primary:hover, .btn-primary:focus, .btn-primary:active {
        color: #fff !important;
        background-color: #f25518 !important;
        border-color: #d73c00 !important; /*set the color you want here*/
    }


@media (max-width: 768px) {
    .btn-primary {
        font-size: 1.3em;
        padding: .5em;
    }
}