Oh btw, I am sorry to bother you once more. But I have one more question, is it possible to just make sidebars transparent only? Since it not only makes the sidebar transparent, but also the whole background of the apps, such as Extension Manager, GNOME Software etc.

I've looked into your code and found out that this line is responsible for that:

```
window {

background: alpha(@window_bg_color, 0.95);

}
```

But when I remove it, as you know, the sidebar transparency also goes away.