Apple's official website currently does not offer the option to customize a phone case directly on its official website. The phone cases sold on Apple's official website are usually pre-designed options with limited designs, materials, and colors. If you need a customized phone case, you can consider the following ways:

1. Third-party manufacturer websites: There are many third-party manufacturers that provide customized phone case services. You can choose the phone model on these websites and design and customize the phone case according to your needs.

2. Local mobile phone accessories stores: Some local mobile phone accessories stores or printing shops may provide customized phone case services. You can ask your local store if there is such an option.

3. Online market platforms: There are many sellers on some online market platforms (such as Taobao, JD.com, Amazon, etc.) that provide customized phone case services. You can search and choose the right seller for customization on these platforms.

However, please note that when using third-party manufacturers, websites, or stores to customize phone cases, be sure to carefully read their terms of service, return and exchange policies, and user reviews to ensure that you choose reliable sellers and reliable quality products.