bigskysoftware/missing

The classless-ish CSS library you've been missing

CSS

797

1,138 commits

updated Jun 13, 2026

See the code

README

MISSING.CSS
The Missing CSS Stylesheet

Docs · Demo · Playground · Releases · GitHub · Discord

missing.css is the missing CSS library that we all wished existed. Add it to your website:

<link rel="stylesheet" href="https://unpkg.com/missing.css">
  • It starts with decent default styling for vanilla HTML, akin to classless CSS libraries.
  • It offers a small set of components based on well-known, semantic markup patterns, with ARIA where appropriate.
  • Finally, it offers a small & curated set of utility classes and custom elements for bespoke elements and layouts.

The goal of missing.css is to reduce needed intervention in HTML. It lets authors

  • start with a good out-of-the-box experience,
  • customize it easily, even create multiple themes,
  • build common components using plain, semantic HTML,
  • create unique sites by applying utility classes as needed.

missing.css is not designed to be a complete styling solution for large websites. It may serve as a basis for a more completely styled site, but does not try to be as complete as Bootstrap or as versatile as Tailwind. It is, however, explicitly designed to be complete enough to use for small sites, internal tools or personal projects.


Missing.css, from Big Sky Software.

Also check out htmx and _hyperscript.

classless-css
classless-css-framework
classless-theme
css
css-framework
css-library
deno
postcss

bigskysoftware/missing

The classless-ish CSS library you've been missing

CSS

797

1,138 commits

updated Jun 13, 2026

See the code

README

MISSING.CSS
The Missing CSS Stylesheet

Docs · Demo · Playground · Releases · GitHub · Discord

missing.css is the missing CSS library that we all wished existed. Add it to your website:

<link rel="stylesheet" href="https://unpkg.com/missing.css">
  • It starts with decent default styling for vanilla HTML, akin to classless CSS libraries.
  • It offers a small set of components based on well-known, semantic markup patterns, with ARIA where appropriate.
  • Finally, it offers a small & curated set of utility classes and custom elements for bespoke elements and layouts.

The goal of missing.css is to reduce needed intervention in HTML. It lets authors

  • start with a good out-of-the-box experience,
  • customize it easily, even create multiple themes,
  • build common components using plain, semantic HTML,
  • create unique sites by applying utility classes as needed.

missing.css is not designed to be a complete styling solution for large websites. It may serve as a basis for a more completely styled site, but does not try to be as complete as Bootstrap or as versatile as Tailwind. It is, however, explicitly designed to be complete enough to use for small sites, internal tools or personal projects.


Missing.css, from Big Sky Software.

Also check out htmx and _hyperscript.

classless-css
classless-css-framework
classless-theme
css
css-framework
css-library
deno
postcss

Significant stargazers

Adam Johnson

3,981 followers · starred Feb 2022

Sebastian Pipping

422 followers · starred Nov 2025

jdx

4,385 followers · starred Jul 2025

Santiago M. Mola

160 followers · starred Jul 2023