Rough Marker highlighting is out of position when zoom is applied to slide

[mrmatho]

Describe the bug

A clear and concise description of what the bug is.

Minimal reproduction

Steps to reproduce the behavior:

1. Create a new Slidev project and open the starter template
2. Add frontmatter to slide 9 (which demos the Rough Marker feature) and apply zoom: 0.8 (or any other than 1)
3. Open slide 9 in the presentation
4. The underline and circles are shown in an incorrect location

Environment

• Slidev version: v51.4.0
• Browser: Google Chrome
• OS: Windows and Mac OS X