playground issue when resizing using horizontal resizer

[userquin]

UnoCSS version

latest

Describe the bug

From discord: https://discord.com/channels/937808017016119440/937811334907723806/1256298348965793905

Animated GIF with the issue

I'm going to fix it.

Reproduction

Just open the playground and try to resize using the horizontal divider: my tests only on chrome

System Info

No response

Validations

• Read the Contributing Guidelines.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.