Provide reasonable color defaults when palette background color is selected (#3909)

quadrat/assets/theme.css

@@ -516,6 +516,11 @@ ul ul {
 	padding: var(--wp--custom--margin--horizontal);
 }
 
+.has-pink-background-color,
+.has-white-background-color {
+	color: var(--wp--preset--color--blue);
+}
+
 .wp-block-post-content p a {
 	-webkit-text-decoration-line: underline;
 	        text-decoration-line: underline;

quadrat/sass/_colors.scss

@@ -0,0 +1,6 @@
+// Provide reasonable default colors when a background color is chosen 
+// that doesn't work with the default foreground color
+.has-pink-background-color,
+.has-white-background-color {
+	color: var(--wp--preset--color--blue);
+}

quadrat/sass/theme.scss

@@ -16,6 +16,7 @@
 @import "blocks/search";
 @import "blocks/table";
 @import "blocks/pullquote";
+@import "colors";
 @import "elements/links";
 @import "elements/forms";
 @import "header";