@media (max-width: 767px) {
.continuar{
    right: 2px;
    bottom: -19px;
    font-size: 18px !important;
    border: none !important;
}

.voltar{
    left: 2px;
    bottom: -19px;
    font-size: 18px !important;
    border: none !important;
}
}

.continuar{
background: transparent !important;
border: none !important;
}

.voltar{
background: transparent;
}