Z indices are being modified

[christianmemije]

Summary

Somewhere in our webpack build, z indices are being reduced. Not sure if this is done per vue file or plugin. This is causing issues.

Example

System information

• Version: Develop

How to reproduce

1. Open a modal
2. Inspect the modal-overlay z-index. Should be 24, but was changed to 5

[rtibbles]

Guessing this would have to be happening in postcss? Can't think what else would be actively modifying css values.

[indirectlylit]

vuejs-templates/webpack#614

[rtibbles]

Also possible that webpack-rtl-plugin (which depends on cssnano which uses https://www.npmjs.com/package/postcss-zindex) may be playing a role here.