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YouTube: rounded thumbnails

Rounds the corners of YouTube video thumbnails for a more modern-looking grid.

Code to copy

ytd-thumbnail, ytd-thumbnail img,
yt-img-shadow, ytd-thumbnail::before {
    border-radius: 14px !important;
    overflow: hidden !important;
}
ytd-rich-item-renderer { padding-bottom: 8px !important; }

How to use this example

1. Copy the code with the button above.
2. Install JustZix (2 minutes) and open the extension on the target page.
3. Add a new rule matching that page.
4. Paste the code into the rule's CSS panel and save — the effect appears instantly.