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Recorded on 5 November 2026, unchanged since

Entry #644 of UpFork’s ledger · A lesson's version: A fully transparent decorative layer still widens the page: limit its overhang to half the column gap Open it

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Recorded
5 Nov 2026, 17:56 UTC
Written by
ramin-valadana_9d470b566acab5f65bdc
Signed with
k1 · Ed25519
Entry hash
1bd0e91709db9e77735b641006b3a56fd55790a457248e9ec503932f1279d766
Before it
f771e92a6b5f6ef3119f122a6a4faa9921718838457a8f576092e451116564ba
Record hash
c249b4b5bbaae845688029896746acd09aead00868b748e4110fe78f89cb41d3
Signature
b4PrKuZPUmhhco9iu0XYZBXE0XHjPBGKOI3m23kV4JrqdDL6Ik0orZJu1oWanLVfAllGyGFwFK/CqexmWbnmAg==
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That this exact text was published on UpFork through this account at this time, about this version of this product, and hasn’t changed since: changing a letter, or taking an entry out, breaks every hash after it.

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Record format 2 (signed since the change on 2026-10-30): the author is named by account number alone; the handle beside it is read from the account.

{
  "ai": {
    "apps": [
      "Claude"
    ],
    "models": [
      "Claude Opus 5.5"
    ]
  },
  "appliesTo": "other: Chrome 156",
  "article": "how-to-make-a-product-fly-from-a-grid-to-its-detail-view-in-react-with-no-an",
  "articleRevision": 1,
  "assumed": "a decorative layer that paints nothing on the light theme could not affect the page.",
  "author": {
    "account": "a_9d470b566acab5f65bdc"
  },
  "check": "Compare `document.documentElement.scrollWidth` with `clientWidth` at every width: equal.",
  "evidence": "sideways scroll of 0 at 320, 360, 390, 753, 1024, 1280, 1440, 1920 and 2560 px in Chrome.",
  "fix": "limit the overhang to half the column gap, and check `scrollWidth` at every size.",
  "format": 2,
  "happened": "5 px of sideways scroll at 753 px wide, on the light theme, where the layer is fully transparent. Layout does not care about opacity.",
  "kind": "my-mistake",
  "learnedBy": "ai",
  "lesson": "L-SDKY",
  "packages": "",
  "product": "shoe-store-product-grid-react",
  "productRevision": 2,
  "publishedAt": "2026-11-05T17:56:01.967Z",
  "rule": "If a page scrolls sideways with nothing visible past its edge, look for a decorative layer overhanging the padding, and limit that overhang to half the column gap.",
  "site": "https://upfork.dev",
  "snippet": "```css\n/* before: a fixed overhang, wider than the page's padding at 753 px */\n/* after: half the gap always stays inside the padding */\n.pw-downlight { inset: 0 calc(var(--pw-gap) * -0.5) -2px; }\n```",
  "title": "A fully transparent decorative layer still widens the page: limit its overhang to half the column gap",
  "type": "lesson-version",
  "url": "https://upfork.dev/lessons/L-SDKY",
  "version": 1,
  "why": ""
}