# EPUBCheck CSS-006: CSS selector specifies fixed position

Source: https://epublab.com/epubcheck/css-006/ (updated 2026-11-03)

EPUBCheck CSS-006 is a usage message: “CSS selector specifies fixed position.” A CSS rule uses position: fixed, which reading apps handle inconsistently in paginated text.

- Official message (EPUBCheck 5.4.0): CSS selector specifies fixed position.
- Default severity: Usage

## Typical causes

- Styles copied from a website, such as fixed headers.

## How to fix it

- Remove position: fixed or replace it with normal flow.

Message text and severity: EPUBCheck (W3C, BSD-3-Clause). Explanation: EPUBLab.