Add WordPress Core CSS into editor-style.css

To add styles that affect TinyMCE you need to do the following:

add_action( 'admin_init', 'editor_styles' );
function editor_styles() {
       add_editor_style( get_stylesheet_directory_uri() . 'editor-style.css' );
}

Basically it will load a editor-style.css file located in the root of your child theme.

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