---
title: "Breaking: #61471 - EXT:t3skin CSS files moved to less"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:breaking-61471"
source: "Changelog/7.0/Breaking-61471-t3skinCssFilesMovedToLess.rst"
modified: "2026-09-14T09:47:36+00:00"
---

# Breaking: #61471 - EXT:t3skin CSS files moved to less

See [forge#61471](https://forge.typo3.org/issues/61471)

## Description

All CSS files in EXT:t3skin are moved to less files and handled by less CSS pre processor
and merged to a single CSS file.

## Impact

Single CSS files can not be included anymore. This may result in broken layouts.

## Affected installations

A TYPO3 instance is affected if an extension loads single CSS files from EXT:t3skin. Backend modules of
extensions usually get CSS core stuff loaded by default, which will not be a problem. An extension is
only affected if single CSS files are explicitly referenced. This should be a rare case.

## Migration

Most simple solution is to copy over the "old" CSS file from an older instance. Directly including those
files from t3skin is discouraged. A better solution is to refactor the extension to use the full t3skin
CSS file and to overlay it with required changes in an own file.