# Fixes `Unknown file extension ".css"` error

**Version:** v5.25.1

**Published:** May 13, 2026

This release fixes CSS file handling errors and improves the Studio pane layout by truncating long document titles instead of allowing them to overflow.

## 🐛 Notable bugfixes and improvements

- Fixes an issue that caused the ` Error: Unknown file extension ".css"` error.
- Long document titles in the Studio pane header now truncate with an ellipsis instead of overflowing into adjacent panes (e.g. when the Comments pane is open).
- fix: show login screen instead of error when session expires