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Top ruler overlay

Shows a horizontal ruler at the top of the page with 10 px ticks and bolder marks every 50 px.

Code to copy

body {
  background-image:
    repeating-linear-gradient(to right,
      #928374 0 1px, transparent 1px 10px,
      #928374 10px 11px, transparent 11px 50px);
  background-size: 100% 12px;
  background-repeat: no-repeat;
  background-position: top left;
  padding-top: 12px !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.