[Button] Duplicate classes

[nodirbekprogrammer]

Steps to reproduce

Steps:

1. Open this link to live example: Link
2. Inspect any button

Current behavior

All classNames except MuiButtonBase-root are duplicates.

This makes it difficult to read and loads unnecessary content into the browser.

Expected behavior

Fix it.

Context

No response

Your environment

Browser: Chrome

Search keywords: button, className, duplicate