The buttons are not rendered with a filled background color, only the border color is applied, on XWiki 14.10

[sarahxb]

Describe the bug
The color you set for the button macro is not applied to the filled background, it remains white, only the border is colored.

Steps to reproduce

1. Go to any page
2. Add a button macro and set a color (eg. "Red", or use the color picker)
3. Click Save and View

Expected behavior
A fully colored button is on the page.

Actual behavior
A button with only the border colored is on the page.

Screenshots

Environment

• OS: Linux
• Browser: firefox, chrome
• XWiki version 14.10.15
• App version 1.30.1

Additional context
I have tested this on XWiki 15.10 as well, no issues there.