[openstreetmap/openstreetmap-website] White grid around map tiles when page zoom set to 33%, 67%, 80%, 85%, 90% or 115% (Issue #5109)

[Boris Verkhovskiy]

### URL

https://www.openstreetmap.org

### How to reproduce the issue?

1. Open https://www.openstreetmap.org
2. Press Cmd+- (or ctrl+- on Windows/Linux I think) to set the browser's Page Zoom to 90%

### Screenshot(s) or anything else?

<img width="866" alt="Screenshot 2024-08-22 at 14 42 18" src="https://github.com/user-attachments/assets/7eff17a1-4f9d-40c4-a766-0fdb6b965cce">

I see this grid at 33%, 67%, 80% and 90% zoom but not at 25%, 50% or 100% or more. At 75% zoom I see only a vertical grid

<img width="739" alt="Screenshot 2024-08-22 at 14 43 21" src="https://github.com/user-attachments/assets/5f4549dd-a9e3-4b2d-9adf-67cb8d42aa94">

This is on Chrome 127.0.6533.120, macOS 14.6.1, 2020 MacBook Air M1 with a 13.3-inch (2560 × 1600) display. I don't see the issue on Firefox at any zoom level. On Safari I see it at 85% and 115% zoom, no others.

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