How to draw at the margin of a page?

Questions
,
2

Hi Oscar, I recommend reading about measure to figure out how it works. Here’s my code:

Margin calculation

/// Reference:
/// https://typst.app/docs/reference/layout/page/#parameters-margin
#let calc-margin(margin, shape) = if margin == auto {
  2.5 / 21 * calc.min(..shape)
} else {
  margin
}

Show rule

#show heading.where(level: 1): it => {
  pagebreak(weak: true)
  set text(
    size: 1.6em,
    weight: "regular",
  )
  set align(right)
  block(
    above: 20pt,
    below: 50pt,
    context {
      let title-content = {
        smallcaps([Chapter #counter(heading).display(heading.numbering)])
        linebreak()
        text(size: 1.3em)[*#it.body*]
      }
      title-content
      place(
        dx: calc-margin(page.margin, (page.width, page.height)),
        horizon + right,
        rect(
          fill: black,
          height: measure(title-content).height,
        ),
      )
    },
  )
}

I also modified the chapter numbering to make it work properly. Hope this helps :slight_smile:

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