Formatting for GPA calculator seems off

The documentation for the GPA feature seems to be "highlighted". Perhaps it should only highlight the tips section? However, the instructions still can be followed. 


![GPA Calculator.png](https://raw.githubusercontent.com/leongxingyu/ped/main/files/3baaeb47-8db8-4f76-a407-1672eb2c9ddc.png)￼