Remove Credit card option

Hi, I would like to remove that stripe credit card option from the checkout. I use another card service and only want the apply pay/payment request button options to show up.

I saw another post saying to add this to the css. But i guess i don’t know where to add it. I tried adding it to the theme css but it didn’t do anything.

Thanks.

.wc_payment_method.payment_method_stripe {
display: none;
}

.payment_box.payment_method_stripe {
display: none !important;
}

The page I need help with: [log in to see the link]