Redhill: update style-child-theme-editor

redhill/sass/style-child-theme-editor.scss

@@ -21,12 +21,14 @@
 
 // Reset the font-family override on html to make editor fonts match front-end
 html {
-  font-family: #{map-deep-get($config-global, "font", "family", "primary")};
+  font-family: #{map-deep-get($config-global, "font", "family", "primary")}; // For browsers without CSS custom properties support.
+  font-family: var( --font-headings, #{map-deep-get($config-global, "font", "family", "primary")} );
 }
 
 // Set the correct font family/size for the title
 .editor-post-title .editor-post-title__block .editor-post-title__input {
-  font-family: #{map-deep-get($config-global, "font", "family", "primary")};
+  font-family: #{map-deep-get($config-global, "font", "family", "primary")}; // For browsers without CSS custom properties support.
+  font-family: var( --font-headings, #{map-deep-get($config-global, "font", "family", "primary")} );
   font-size: #{map-deep-get($config-global, "font", "size", "xxxl")};
   text-align: center;
 }

redhill/style-editor.css

@@ -195,10 +195,12 @@ a {
 
 html {
 	font-family: Palatino, "Palatino Linotype", "Palatino LT STD", "Book Antiqua", Times, "Times New Roman", serif;
+	font-family: var(--font-headings, Palatino, "Palatino Linotype", "Palatino LT STD", "Book Antiqua", Times, "Times New Roman", serif);
 }
 
 .editor-post-title .editor-post-title__block .editor-post-title__input {
 	font-family: Palatino, "Palatino Linotype", "Palatino LT STD", "Book Antiqua", Times, "Times New Roman", serif;
+	font-family: var(--font-headings, Palatino, "Palatino Linotype", "Palatino LT STD", "Book Antiqua", Times, "Times New Roman", serif);
 	font-size: 2.48832rem;
 	text-align: center;
 }