Abrupt change between Scala 3 and 4. Scale 1, 2 and 3 almost identical [Homepage Block]

[maryhelenmaccarth]

Describe the bug
The scales 1, 2 and 3 that allow you to adjust the size of the font remain almost the same without further change between them. This causes a sudden and abrupt change in the scale 4.

I tried a version of the Newspack Block from September of last year to see if the same problems existed, and indeed they did.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'Homepage Block'
2. Click on 'Grild'
3. Scroll down to 'Scale'
4. Select Scale 1, 2, 3 and 4 and save your changes each time, and see "preview".

Screenshots
https://imgur.com/a/A5zv1f8 Theme Publication and Twenty Twenty one.
The link must be opened in a new window in Edge or Chrome, outside github, order for its content to be visible.
In the images are about two different Themes as I said, the first one corresponding to Scala 4, the next 3, 2 1 successively.

Expected behavior
A more noticeable and gradual change, mostly gradual between scales 1, 2, 3 and 4. @kgagne

P.S: It was my intention to share the code of said block, but it was not possible to do it and preserve the privacy of the website link that belongs to a client.