Mostrar los botones de giro del número de entrada, número de entrada de spinner
input[type=number]::-webkit-outer-spin-button,
input[type=number]::-webkit-inner-spin-button {
-webkit-appearance: inner-spin-button !important;
-moz-appearance: textfield !important;
appearance: textfield !important;
opacity: 1;
}
Amin Arjmand