Can't change some parts

can change some parts but not all here is what I have working.
------
#coupon-button {
color: red;
}

#coupon-input {
color: blue;
}

#coupon-input, #coupon-button{

font-family: Damion, cursive;
}

above i want to " change " font color and font style

In the custom CSS code you posted it seems you already knew how to change the font color and font style of the coupon.

If you were looking for something different, please let us know so we could check for possible options.

Thank you.