The dotted separator wasn't displaying because the height of the
separator was too small. This change overrides the height for the dotted
separator only.
* Canard: apply default button styles to all button blocks
Not just those in entry-content
* Add default button colors
* Include buttons in color annotation selectors
* Add missing default border color
* For RTL, add space between link and button in file block.
* For RTL, remove border from verse block.
* Remove bottom margin from captions in editor.
* Correct citation font size in editor.
* Correct pre tag font size in editor.
* Add background thead in editor.
* Correct font size in th in editor.
* Add styles for definition lists in editor.
