1. Stylish now requires payment and only allows adding 3 custom styles. When saving a 4th style, it automatically redirects to its official website, causing the addition to fail. See Figure 1.
2. Although the price is not too expensive, over the course of a year, purchasing dozens of more essential software and services still adds up to a significant expense. Moreover, I only need to change the background color of web pages and do not require other powerful features. Reference: https://www.shuijingwanwq.com/2017/09/06/1880/
3. I finally found an alternative extension: Stylus. After the well-known extension Stylish ceased development (the subsequent maintainers were not the original author), Stylus was developed based on its forked version 1.5.2. See Figure 2.
4. After installation, the final usage interface is as follows, and the user interface is more friendly compared to Stylish. The usage method is largely the same as Stylish. See Figure 3.
