Any easy method to change bg of code blocks on all sites?

[sisrfeng]

I've forked a global light style and changed some colors. Welcome to use and improve it https://userstyles.world/style/5699/simple-global-light.
I meet a problem: The bg of code blocks look good on some site, e.g. github, but look ugly on kaggle, csdn((a site in China), etc.
Any easy method to make the bg of code lines the same as the bg of the code blocks?

1. look good on github
   

2.ugly on kaggle

3. ugly on CSDN (a site in China)