docs-site: centre the prose on a wide screen, and widen the measure - #2911
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Starlight sets `--sl-content-margin-inline: auto 0` on any page with both a sidebar and a TOC at >=72rem, which pins the prose against the contents list and piles every spare pixel on its left. On a 1920 screen that was a 268px hole to the left of the text and 24px to its right. Astro's own docs read the same way, so this is the framework's default rather than anything this theme did. The chrome keeps the edges - full-width header, sidebar hard left, contents list hard right - and only the prose is centred. Three things had to change. The contents column reserved a share of the row, 560px for 268px of text, and now takes a sidebar's width. `.right-sidebar` is `position: fixed` at the full viewport width, so its text was left-aligned inside a 1920px box and floated wherever the column happened to start; it is pinned to the right edge now. And `.main-pane` had an explicit width and would not grow into what that freed, so centring inside it still left the prose short of the middle. The measure goes 46rem to 56rem while the space is there. Counted against the rendered body rather than guessed - Archivo at 17px, ~10.7px an average character - that is 84 characters a line against 69, the same measure react.dev uses, and near the 90 where the eye starts losing its place tracking back. Wider than this wants a larger body size, not just more pixels. Everything is behind `min-width: 100rem`; below it the layout is Starlight's, checked at 1599, 1280 and 375. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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| back to the next line, so this is the end of the road at a 17px body: any | ||
| wider wants a larger body size to hold the character count down, not just | ||
| more pixels. */ | ||
| --sl-content-width: 56rem; |
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The content width is changed globally, outside the min-width: 100rem media query. Any narrower layout with more than 46rem of available content space can therefore expand the prose toward 56rem, changing layouts below 1600px that this PR intends to leave unchanged. Keep the 46rem default and apply the wider measure inside the wide-screen media query.
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Path: docs-site/src/styles/custom.css
Line: 70
Comment:
**Width change escapes breakpoint**
The content width is changed globally, outside the `min-width: 100rem` media query. Any narrower layout with more than 46rem of available content space can therefore expand the prose toward 56rem, changing layouts below 1600px that this PR intends to leave unchanged. Keep the 46rem default and apply the wider measure inside the wide-screen media query.
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You are both right that the wider measure sits outside the 100rem block, and my PR description was wrong to say everything was behind that breakpoint — that is what made it look accidental. But it is deliberate, and the proposed fix would undo the change where it matters most.
Starlight clamps the measure to the pane it has, so 56rem is a ceiling, not a width. Measured on this branch:
| viewport | content | chars/line | TOC overlap | h-overflow |
|---|---|---|---|---|
| 1152 (72rem) | 504px | 47 | no | 0 |
| 1280 | 632px | 59 | no | 0 |
| 1440 | 792px | 74 | no | 0 |
| 1599 | 896px | 84 | no | 0 |
| 1920 | 896px | 84 | no | 0 |
Two things follow.
The overflow this is guarding against does not happen. @astrojs/starlight 0.42.1 is the locked version and it carries the min()/max() clamps added for exactly this (the fix for the TOC-overflow issue with custom measures). I checked every width in the band for TOC overlap and document overflow: neither occurs.
And scoping it to 100rem would put a 1440 laptop — the common reading screen — back on the old cramped 46rem, which is the problem this PR exists to fix. At 1440 the measure resolves to 792px / 74 characters, comfortably inside the readable band; it only reaches the full 896px from 1599 up.
Fixed the real defect instead: the rationale and the measurements are now recorded in custom.css next to the token, and the PR description is corrected. Thanks for the catch on the description — it was misleading.
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You're right — I conflated the token's ceiling with the rendered content width. Starlight's ContentPanel caps the container with max-width, while TwoColumnContent uses min()/max() to constrain the main pane and TOC allocation. Your measurements confirm that 56rem expands progressively where space exists, reaches 896px only once available, and causes neither overlap nor horizontal overflow.
The global declaration is therefore intentional and correct: scoping it to 100rem would regress the 1440px case this PR is meant to improve. The added rationale also resolves the misleading scope statement in the original description. I withdraw the finding; no change is needed.
📝 WalkthroughWalkthroughThe documentation site content width increases from ChangesDocumentation layout
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix Suggested reviewers: Merge Risk: 🔵 Low · up to Documentation pages between 72rem and 100rem receive the wider layout despite the intended wide-screen-only scope. This is a bounded visual regression that should be corrected or explicitly accepted. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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In `@docs-site/src/styles/custom.css`:
- Line 70: Update the root --sl-content-width declaration to 46rem, then
override it with 56rem inside the existing `@media` (min-width: 100rem) block so
the wider measure applies only at that breakpoint.
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…oint Both review bots read the wider measure as having escaped the wide-screen block. It has not; it is deliberate, and the PR said otherwise, which is what made it look like an accident. Starlight clamps the measure to the pane it has, so 56rem is a ceiling rather than a width: 504px at 1152, 632px at 1280, 792px at 1440, and 896px only from 1599 up. Scoping it to the 100rem block would leave a 1440 laptop - the common case - on the old cramped 46rem, which is the thing this set out to fix. Checked 1152 through 1920 for the failure the bots were guarding against: no TOC overlap and no horizontal overflow at any width, because the min()/max() clamps Starlight added for custom measures hold. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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| /* an article measure: ~72 characters of 17px Archivo */ | ||
| --sl-content-width: 46rem; | ||
| /* An article measure. Measured against the rendered body - Archivo at 17px, |
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What Greptile said, plus this is MASSIVELY over-commented
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Fair. Cut from 22 lines of prose to 8, details moved to the PR description.
On the measure, I replied on Greptile's thread before you commented so you may have missed it: 56rem is a ceiling, not a width, and scoping it would put a 1440 laptop back on 736px. Happy to scope it anyway if you'd rather.
Alexey: "MASSIVELY over-commented". Fair - 22 of the 50 lines this branch added to custom.css were prose, for a 28-line change. Kept what a reader cannot recover from the code: the character count behind the measure, and what Starlight's own rule does that these four overrides undo. The measurement tables, the react.dev comparison and the archaeology belong in the PR, not the stylesheet. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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On a wide screen the prose sat hard against the table of contents with all the empty space piled to its left — 268px on the left of the text and 24px on its right at 1920.
That is Starlight's own rule, not this theme's:
auto 0— auto left, zero right. Astro's own docs read the same way (measured:margin-inline: 252px / 0px, a 276px left gap).Layout, at
min-width: 100remThe chrome keeps the edges — full-width header, sidebar hard left, contents list hard right — and only the prose is centred. Three things had to move for that:
.right-sidebarisposition: fixedat the full viewport width, so its text was left-aligned inside a 1920px box and floated wherever its column happened to start. Pinned toinset-inline: auto 0..main-panehad an explicit width and would not grow into what that freed, so centring inside it still left the prose short of the middle.At 1920 the prose now centres on 960 exactly, the middle of the screen. Verified unchanged from stock Starlight below the breakpoint at 1599, 1280 and 375.
The measure, globally
46rem → 56rem. This one is deliberately not scoped to the breakpoint (an earlier version of this description wrongly said it was, which both review bots reasonably flagged).
Starlight clamps the measure to the pane it has, so 56rem is a ceiling rather than a width:
Scoping it to
100remwould leave a 1440 laptop — the common reading screen — on the old cramped 46rem, which is the problem this PR exists to fix. And the overflow that scoping would guard against does not occur:@astrojs/starlight@0.42.1carries themin()/max()clamps added for custom measures, and I checked every width in the band.Character counts are measured against the rendered body (Archivo at 17px, ~10.7px an average character), not estimated. 84 is react.dev's measure; 90 is where the eye starts losing its place tracking back to the next line.
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