• The issue is present in the latest release.
• I have searched the issues of this repository and believe that this is not a duplicate.

Current Behavior 😯

The primary and secondary colors are identical between the light and dark theme.

Expected Behavior 🤔

The color should becomes less saturated as in the demos of the documentation and as specified by the Material Design specification.

Steps to Reproduce 🕹

https://codesandbox.io/s/material-ui-dark-theme-41nm4

Your Environment 🌎