# wesbos/aprilFools.css

Harmlessly goof up your co-workers browser and chrome dev tools

Repository: https://github.com/wesbos/aprilFools.css
Canonical: https://ross.abutalabs.com/products/aprilfoolscss
Language: CSS
License Family: other
Last push: 2019-03-27T08:26:09+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 4912, "days_push": 2716, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1274, forks 126 (observed 2026-08-28T04:04:12.864656+00:00)

## What it is
A collection of harmless prank CSS snippets that you paste into a browser's user stylesheet (Chrome's Custom.css or Firefox's userContent.css) so they apply to every website the victim visits. Effects include rotating pages upside down, spinning sites, blurring content periodically, and flipping images, with several webkit-only tweaks aimed at Chrome dev tools.

## Use cases
- prank my coworker's browser on april fools
- make every website appear upside down with css
- css snippets for chrome user stylesheet
- mess with how firefox renders all websites
- harmless developer pranks and css jokes
- flip all images on every webpage using css

## When to choose
- You want harmless, reversible April Fools' gags on a colleague's machine using only CSS
- You need ready-made, commented user-stylesheet snippets for Chrome and Firefox
- You want visual effects that apply globally to every site without extensions or JavaScript

## When to avoid
- You need a real styling library, framework, or theme for production work
- You require browser support without user-stylesheet overrides, since modern Chrome versions have limited or removed Custom.css support
- You need anything persistent, scriptable, or genuinely functional rather than a one-day joke

## Facets
- artifact type: plugin
- maturity: stable
- function: theme, animation
- domain: web-development, frontend, web-design
- platform: browser, cross-platform
- tags: prank, april-fools, css-snippets, user-stylesheet, custom-css, chrome, firefox, practical-jokes, copy-paste-css

## Member repositories
- wesbos/aprilFools.css (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:12.864656+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T05:03:10.106587+00:00, confidence not recorded.
  - readme: https://github.com/wesbos/aprilFools.css (fetched 2026-08-28T04:04:12.864656+00:00, sha 24c1625dc8ba)
- Data as of 2026-08-30T08:39:29.467469+00:00.