Index: wp-content/themes/twentyseventeen/assets/css/editor-blocks.css
===================================================================
--- wp-content/themes/twentyseventeen/assets/css/editor-blocks.css	(revision 53167)
+++ wp-content/themes/twentyseventeen/assets/css/editor-blocks.css	(working copy)
@@ -458,6 +458,12 @@
 	margin-top: 0.5em;
 }
 
+.wp-block-pullquote blockquote, 
+.wp-block-pullquote cite, 
+.wp-block-pullquote p {
+    	color: inherit !important;
+}
+
 /* Caption styles*/
 
 [class^="wp-block-"]:not(.wp-block-gallery) figcaption {