Twenty Eleven: Button blocks don't apply custom colours

[laurelfulford]

The selectors used for Twenty Eleven's button blocks are too specific, the styles for the editor custom colours don't override them on the front-end.

[laurelfulford]

Twenty Eleven - custom colours correct in editor

[laurelfulford]

Twenty Eleven - custom colours on front end - before

[laurelfulford]

Twenty Eleven - custom colours on front end - after

[laurelfulford]

45433.patch​ makes the selectors adding the text and button colours to the buttons less specific, so the custom colour selectors can override them.

[davidakennedy]

Hey @laurelfulford! This looks good to go after some testing.

[Joen]

Patch looks good 👍 👍! Nicely done.

[laurelfulford]

In 44191:

Twenty Eleven: Fix button block custom colors on front end.

Simplify some of the button block’s CSS selectors in the theme, to make sure the default colors don’t override the custom colors on the front end.

Fixes #45433.

[desrosj]

Reopening and marking fixed-5.0 so that this can be properly merged into trunk.

[desrosj]

In 44301:

Twenty Eleven: Correct font-size and button issues.

Update a mistake in Twenty Eleven's block editor styles that erroneously sets the font-size to 300, when it should set the font-weight to 300. This was causing browsers in quirks mode to make the editor font size very large.

Also, simplify some of the button block’s CSS selectors in the theme, to make sure the default colors don’t override the custom colors on the front end.

Props laurelfulford.

Merges [44190] and [44191] to trunk.

Fixes #45421, #45433.