Change WhatsApp color / themes?

Hi, I have the Huawei p20 lite. Can I change the color / themes on WhatsApp so that it looks (similar) to an iPhone?

No, you can only change the background, with Android it should always be green, with different apps the apps with different designs, this should be possible. I don't know if there's such an app for whatsapp and if there's even an iPhone design for it. However, you can revise the Android system with designs through the offered apps, so I think that this should also be possible