What
Claude Code now includes new instructions about page layout. They tell Claude that pages it generates must also work at phone width, about 400 pixels across, and that the page must never scroll horizontally. They also call for a 16-pixel margin at the edges, among other layout rules.
Why
These instructions would change the HTML that Claude writes for artifacts, the standalone pages it can create, so that those pages fit small screens.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
It is not clear when these instructions are given to Claude.