Reddit: incorrect color for post blocks

### Is there an existing issue outlining your problem?

- [x] I am using the latest version of the userstyle.
- [x] I have searched the existing issues and they do not solve my problem.

### What userstyles are you seeing the problem on?

lbl:reddit

### Describe your problem.

**The color of the block of posts are black, and not catpuccin themed:**

**Fix:**

```
.bg-neutral-background {
background-color: @base;
}
```

### Attach screenshots.

_(Attached above)_

### What browser(s) are you seeing the problem on?

Zen 1.19.3b

### Any additional comments?

_No response_

Start by locating the Reddit userstyle for lbl:reddit and the .bg-neutral-background rule shown in the issue. Apply the provided themed background-color change, then preview the post blocks in Zen 1.19.3b and confirm they match the Catppuccin theme.

Written by the indexing model from the issue text.