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100 px grid overlay

Overlays a translucent 100x100 px grid on the page to help check element alignment.

Code to copy

html::after {
  content: "";
  position: fixed; inset: 0; z-index: 99998;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(to right, rgba(255,0,0,0.12) 0 1px, transparent 1px 100px),
    repeating-linear-gradient(to bottom, rgba(255,0,0,0.12) 0 1px, transparent 1px 100px);
}

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.