Very low contrast 

### 🐛 The bug

<img width="657" alt="image" src="https://user-images.githubusercontent.com/803639/216845836-ea51ca79-e389-44d8-b969-0fa7105637c0.png">
So, this code colorize theme has such a low contrast. 

### 🛠️ To reproduce

https://regexp.dev/getting-started/setup

### 🌈 Expected behaviour

Please, make contrast in code section more readable.

### ℹ️ Additional context

_No response_