The CSS output in custom-css.php was using the background shorthand instead of background-color when setting the background color of elements. The caused other properties being unintentionally overwritten, like the background-repeat and background-size on cover blocks with an image and color set (see #957).
This PR replaces all uses of the background shorthand with background-color, in both twentytwenty_get_customizer_css() and twentytwenty_get_elements_array().
The CSS output in
custom-css.phpwas using thebackgroundshorthand instead ofbackground-colorwhen setting the background color of elements. The caused other properties being unintentionally overwritten, like thebackground-repeatandbackground-sizeon cover blocks with an image and color set (see #957).This PR replaces all uses of the
backgroundshorthand withbackground-color, in bothtwentytwenty_get_customizer_css()andtwentytwenty_get_elements_array().Fixes #957.