`.mw-infobox` is in use by [[ https://codesearch.wmflabs.org/search/?q=Html%3A%3AinfoBox&i=nope&files=&repos= | Html::infoBox ]] by the Web Installer.
It shouldn't receive different color appearance other than one of the standard boxes `.warningbox` or `.messagebox` as they are also available in 'shared.css' and are aligned to Design Style Guide.
| Current | Proposed
| {F30325039} | {F30330344}
This has last been touched ~8 years ago.
===== Dev notes
[] Remove all extra visual properties aside of pure box layout properties
[] Replace outdated PNG icon with current standard icon and consider SVG
* [x] Deprecate getInfoBox wrappers in 1.34 (getWarningBox, getErrorBox) – https://gerrit.wikimedia.org/r/c/mediawiki/core/+/537244
* [x] Remove getInfoBox wrappers in 1.35 https://gerrit.wikimedia.org/r/c/mediawiki/core/+/616956
* [x] Replace infobox usages and extend successbox, warningbox and errorbox
** Most were done in https://gerrit.wikimedia.org/r/#/c/mediawiki/core/+/537245/
[x] Remove internal `HTML::infobox` method T268078