# Advance BBCode box on Milk theme

### Problem

Some features of the Advance BBCode box extension (available separately) don't work in the Milk theme.

### Cause

A z-index layering issue in Milk. The extension is working as intended, but hidden behind Milk's white background wrapper.

### Solution

You can remedy the problem by following these steps:

Open: /styles/milk\_v2/theme/common.css

Find:

```
.darken {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    opacity: 0.5;
}
```

Remove

`position: fixed;` 

Save changes, then purge cache.

* [How to purge cache](/getting-started/how-to-purge-cache.md)
* [How to edit code files](/getting-started/how-to-edit-code-files.md)


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