Sometimes the color is missing when running yarn build

[Kimi-Gao]

🐛 Bug Report

Sometimes the color is missing when running yarn build

Have you read the Contributing Guidelines on issues?

YES

To Reproduce

If possible, use https://new.docusaurus.io to create a CodeSandbox reproducible demo of the bug.

(Write your steps here:)

1. Add below code in custom.css

.menu .menu__link.menu__link--active:not(.menu__link--sublist) {
  border: 1px solid rgba(167, 167, 167, 0.2);
}

1. yarn build
2. Search .menu .menu__link.menu__link--active:not(.menu__link--sublist) in build directory

Expected behavior

.menu .menu__link.menu__link--active:not(.menu__link--sublist) {
  border: 1px solid rgba(167, 167, 167, 0.2);
}

Actual Behavior

Your Environment

• Public source code:
• Public site url:
• Docusaurus version used: 2.0.0-alpha.70
• Environment name and version : node v14.15.5 (npm v6.14.11)
• Operating system and version (desktop or mobile): macOS big sur 11.1

Reproducible Demo

If possible, use https://new.docusaurus.io to create a CodeSandbox reproducible demo of the bug.

https://codesandbox.io/s/interesting-night-ze576?file=/src/css/custom.css

[Simek]

I have spotted the similar issue on the React Native website. After upgrade from alpha.66 to alpha.70 this problem started to appear on main website. On alpha.68 the missing color issue was only present in the PWA app.

The current problematic style and the fix:

The same part of CSS code, before the fix, but after the deploy:

[slorber]

Can you try with USE_SIMPLE_CSS_MINIFIER=true docusaurus build ?

[Kimi-Gao]

@slorber thanks, USE_SIMPLE_CSS_MINIFIER=true docusaurus build works fine, there maybe an issue with advanced minification of CSS bundle.

[slorber]

Thanks @Kimi-Gao

Can you try to use the @canary version without that env variable?

This bug may have been fixed already

[lex111]

This is bug in clean-css, which I reported in the issue, so we will wait for release with bug fix for that.

[slorber]

merged

Try again with the latest @canary and we'll re-open if this is not fixed