/* Responsividade de Botão em Bloco */
@media (max-width: 767px) {
    .btn-xs-block {
        display: block;
        width: 100%;
    }

        .btn-xs-block + .btn-xs-block {
            margin-top: 5px;
        }

    input[type="submit"].btn-xs-block,
    input[type="reset"].btn-xs-block,
    input[type="button"].btn-xs-block {
        width: 100%;
    }
}

@media (min-width: 768px) and (max-width: 991px) {
    .btn-sm-block {
        display: block;
        width: 100%;
    }

        .btn-sm-block + .btn-sm-block {
            margin-top: 5px;
        }

    input[type="submit"].btn-sm-block,
    input[type="reset"].btn-sm-block,
    input[type="button"].btn-sm-block {
        width: 100%;
    }
}