How do I make my "50% off square" to black, same colour as CAINTE?

[OneCap]

How do I make my “50% off square” to black, same colour as CAINTE?

My website: www.onecap.se

CAINTE: https://cainte.se/

Use this code if they require you to have a code to access: H2X8K1


[BSS-Commerce]

Hi @OneCap ,
Can you kindly share your store link (with the password, if any) with us? We will check it and suggest you a solution if possible.